diff --git a/assets/scripts.js b/assets/scripts.js
index bf0b652..043ecbd 100644
--- a/assets/scripts.js
+++ b/assets/scripts.js
@@ -34,6 +34,11 @@ var segmentGroups = bv.segmentGroups;
 
 // Persistent state
 var ls = window.localStorage || {};
+if (!('initialized' in ls)) {
+	for (let k in bv.stateHistory)
+		ls["persistentState_" + k] = JSON.stringify(bv.stateHistory[k]);
+	ls['initialized'] = 't';
+}
 
 function msToString(ms) {
 	return new Date(ms).toUTCString().split(' ')[4];
@@ -55,9 +60,9 @@ function preconditionToJS(cond) {
 	} else if (cond[0] == 'eql' && cond.length == 3) {
 		return '(' + cond.slice(1).map(preconditionToJS).join(' == ') + ')';
 	} else if (cond === false) {
-		return false;
+		return 'false';
 	} else if (cond === true) {
-		return true;
+		return 'true';
 	} else if (typeof cond === 'string') {
 		return JSON.stringify(cond);
 	} else {
@@ -91,10 +96,6 @@ function resolveSegmentGroup(sg) {
 		if (v.segmentGroup) {
 			results.push(resolveSegmentGroup(v.segmentGroup));
 		} else if (v.segment) {
-			// TODO: does the included precondition override or
-			// complement the segment precondition?
-			if (!checkPrecondition(v.segment))
-				continue;
 			results.push(v.segment);
 		} else {
 			if (!checkPrecondition(v))
@@ -110,7 +111,7 @@ function resolveSegmentGroup(sg) {
 /// There will be exactly one segment for any timestamp within the video file.
 function getSegmentId(ms) {
 	for (const [k, v] of Object.entries(segmentMap.segments)) {
-		if (ms >= v.startTimeMs && ms < v.endTimeMs) {
+		if (ms >= v.startTimeMs && (!v.endTimeMs || ms < v.endTimeMs)) {
 			return k;
 		}
 	}
@@ -154,25 +155,15 @@ function addItem(ul, text, url) {
 var nextChoice = -1;
 var nextSegment = null;
 
-function setNextSegment(segmentId, comment) {
-	console.log('setNextSegment', segmentId, comment);
-	nextSegment = segmentId;
-	nextChoice = -1;
-	var ul = newList("nextSegment");
-	var caption = 'nextSegment: ' + segmentId;
-	addItem(ul, comment ? caption + ' (' + comment + ')' : caption,
-		'javascript:playSegment("' + segmentId + '")');
-}
-
 function addZones(segmentId) {
 	var ul = newList("interactionZones");
 	let caption = 'currentSegment(' + segmentId + ')';
 	addItem(ul, caption, 'javascript:playSegment("' + segmentId + '")');
 
-	var v = segmentMap.segments[segmentId];
-	if (v && v.ui && v.ui.interactionZones) {
+	var segment = segmentMap.segments[segmentId];
+	if (segment && segment.ui && segment.ui.interactionZones) {
 		var index = 0;
-		for (var z of v.ui.interactionZones) {
+		for (var z of segment.ui.interactionZones) {
 			var startMs = z[0];
 			var stopMs = z[1];
 			let caption = segmentId + ' interactionZone ' + index;
@@ -182,16 +173,14 @@ function addZones(segmentId) {
 	}
 
 	ul = newList("nextSegments");
-	let defaultSegmentId = null;
-	for (const [k, v] of Object.entries(segmentMap.segments[segmentId].next)) {
-		let caption = k;
-		if (segmentMap.segments[segmentId].defaultNext == k) {
-			caption = '[' + caption + ']';
-			defaultSegmentId = k;
+	if (segment) {
+		for (const [k, v] of Object.entries(segment.next)) {
+			let caption = k;
+			if (segment.defaultNext == k)
+				caption = '[' + caption + ']';
+			addItem(ul, caption, 'javascript:playSegment("' + k + '")');
 		}
-		addItem(ul, caption, 'javascript:playSegment("' + k + '")');
 	}
-	setNextSegment(defaultSegmentId);
 }
 
 var currentChoiceMoment = null;
@@ -245,12 +234,14 @@ var timerId = 0;
 var lastMs = 0;
 var currentSegment;
 var lastSegment = null;
+var prevSegment = null; // for breadcrumbs
 var segmentTransition = false;
 var lastMoments = [];
 
 function ontimeupdate(evt) {
 	var ms = getCurrentMs();
 	currentSegment = getSegmentId(ms);
+	let segment = segmentMap.segments[currentSegment];
 
 	if (timerId) {
 		clearTimeout(timerId);
@@ -269,9 +260,10 @@ function ontimeupdate(evt) {
 	// Handle segment change
 	if (lastSegment != currentSegment) {
 		console.log('ontimeupdate', lastSegment, '->', currentSegment, ms, msToString(ms), seeked);
+		prevSegment = lastSegment;
 		lastSegment = currentSegment;
-		if (!seeked) {
-			if (playNextSegment()) {
+		if (!seeked && prevSegment) {
+			if (playNextSegment(prevSegment)) {
 				// playSegment decided to seek, which means that this
 				// currentSegment is invalid, and a recursive
 				// ontimeupdate invocation should have taken care of
@@ -318,7 +310,7 @@ function ontimeupdate(evt) {
 
 		let hash = currentSegment;
 		// Pick the moment which starts closer to the current timestamp.
-		let bestMomentStart = segmentMap.segments[currentSegment].startTimeMs;
+		let bestMomentStart = segment ? segment.startTimeMs : 0;
 		for (let k in currentMoments) {
 			let m = currentMoments[k];
 			if (m.startMs > bestMomentStart) {
@@ -333,7 +325,7 @@ function ontimeupdate(evt) {
 	}
 
 	// ontimeupdate resolution is about a second. Augment it using timer.
-	let nextEvent = segmentMap.segments[currentSegment].endTimeMs;
+	let nextEvent = segment ? segment.endTimeMs : 0;
 	for (let k in currentMoments) {
 		let m = currentMoments[k];
 		if (m.endMs < nextEvent)
@@ -347,7 +339,8 @@ function ontimeupdate(evt) {
 		timerId = setTimeout(ontimeupdate, timeLeft);
 }
 
-function playNextSegment() {
+function playNextSegment(prevSegment) {
+	let nextSegment = null;
 	if (nextChoice >= 0) {
 		let x = currentChoiceMoment.choices[nextChoice];
 		if (x.segmentId)
@@ -357,19 +350,25 @@ function playNextSegment() {
 		else
 			nextSegment = null;
 		console.log('choice', nextChoice, 'nextSegment', nextSegment);
+		nextChoice = -1;
 		applyImpression(x.impressionData);
 	}
 
+	if (!nextSegment && prevSegment && prevSegment in segmentGroups)
+		nextSegment = resolveSegmentGroup(prevSegment);
+
+	if (!nextSegment && prevSegment && segmentMap.segments[prevSegment].defaultNext)
+		nextSegment = segmentMap.segments[prevSegment].defaultNext;
+
+	if (!nextSegment)
+		return false;
+
 	let breadcrumb = 'breadcrumb_' + nextSegment;
 	if (!(breadcrumb in ls))
-		ls[breadcrumb] = lastSegment;
+		ls[breadcrumb] = prevSegment;
 
 	segmentTransition = true;
-	let segment = nextSegment;
-	nextSegment = null;
-	if (segment)
-		return playSegment(segment, true);
-	return false;
+	return playSegment(nextSegment, true);
 }
 
 function jumpForward() {
@@ -387,7 +386,7 @@ function jumpForward() {
 	if (interactionMs) {
 		seek(interactionMs);
 	} else {
-		playNextSegment();
+		playNextSegment(segmentId);
 	}
 }
 
@@ -544,14 +543,15 @@ function choice(choiceIndex) {
 	nextChoice = choiceIndex;
 	newList("choices");
 	if (!currentChoiceMoment.config.disableImmediateSceneTransition)
-		playNextSegment();
+		playNextSegment(prevSegment);
 }
 
 function applyImpression(impressionData) {
 	if (impressionData && impressionData.type == 'userState') {
 		for (const [variable, value] of Object.entries(impressionData.data.persistent)) {
-			console.log('persistentState set', variable, '=', value);
-			ls["persistentState_" + variable] = JSON.stringify(value);
+			let key = "persistentState_" + variable;
+			console.log('persistentState set', variable, '=', value, '(was', key in ls ? ls[key] : 'unset', ')');
+			ls[key] = JSON.stringify(value);
 		}
 	}
 }
@@ -569,6 +569,12 @@ function playSegment(segmentId, noSeek) {
 	return false;
 }
 
+function reset() {
+	ls.clear();
+	location.hash = '';
+	location.reload();
+}
+
 var lastHash = '';
 function playHash(hash) {
 	// console.log('playHash', lastHash, '->', hash);
diff --git a/assets/styles.css b/assets/styles.css
index 3a8acb7..201cdda 100644
--- a/assets/styles.css
+++ b/assets/styles.css
@@ -262,7 +262,7 @@ ul.controls-tips {
     padding: 16px;
     width: inherit;
     margin: 0;
-    margin: 29px auto;
+    margin: 15px auto;
     text-align: left;
 }
 
@@ -271,8 +271,8 @@ h2 {
     font-size: 1em;
 }
 
-ul.file-tips li,
-ul.controls-tips li {
+ul.file-tips > li,
+ul.controls-tips > li {
     font-size: .45em;
 }
 
diff --git a/index.html b/index.html
index 58b9c70..6b3de90 100644
--- a/index.html
+++ b/index.html
@@ -34,22 +34,19 @@
 
 	<title>Bandersnatch Interactive Player</title>
 	<meta name="description"
-		content="With this online(html) video player you can watch Bandersnatch episode of Black Mirror interactively." />
-	<meta name="keywords" content="Bandersnatch,Bandersnatch Interactive Player,Interactive Player,whatch," />
+		content="Stand-alone open-source interactive HTML player for Black Mirror - Bandersnatch" />
+	<meta name="keywords" content="Bandersnatch,Bandersnatch Interactive Player,Interactive Player,watch," />
 	<script src="assets/bandersnatch.js"></script>
 	<script src="assets/SegmentMap.js"></script>
 	<script src="assets/scripts.js"></script>
-	<link rel="stylesheet" type="text/css" href="assets/styles.css">
-	<!-- Global site tag (gtag.js) - Google Analytics -->
-	<script async src="https://www.googletagmanager.com/gtag/js?id=UA-132739093-1"></script>
 	<script>
-		window.dataLayer = window.dataLayer || [];
-		function gtag() { dataLayer.push(arguments); }
-		gtag('js', new Date());
-
-		gtag('config', 'UA-132739093-1');
+	 // keep localizable strings out of scripts.js
+	 function askReset() {
+		 if (confirm('Are you sure you want to reset all choices, breadcrumbs, and watched scenes?'))
+			 reset();
+	 }
 	</script>
-
+	<link rel="stylesheet" type="text/css" href="assets/styles.css">
 </head>
 
 <body>
@@ -60,12 +57,12 @@
 					<div class="file-area">
 						<div class="contact">
 							<p>
-								Developed by <a href="https://github.com/mehotkhan" target="_blank">Mehotkhan</a> ,for
-								info <a href="https://github.com/mehotkhan/BandersnatchInteractive"
-									target="_blank">https://github.com/mehotkhan/BandersnatchInteractive</a>
-
-								,<b>if you want some donation : my bitcoin wallet :</b>
-								<pr>1CxaCJbh4VMNicnpktsBVfnVU5xq4QYyHW</pr>
+								Authors:
+								<a href="https://github.com/joric/bandersnatch/">Original version</a> - <a href="https://github.com/joric/">joric</a> |
+								Web page, subtitles - <a href="https://github.com/mehotkhan">Mehotkhan</a> (<a href="bitcoin:1CxaCJbh4VMNicnpktsBVfnVU5xq4QYyHW">donate</a>) |
+								Many fixes, improvements, and everything else - <a href="https://github.com/CyberShadow">CyberShadow</a>
+								<br>
+								This player remembers your choices and watch history. <a href="javascript:askReset()">Click here to reset and start from scratch.</a>
 							</p>
 						</div>
 						<input id="fileinput" type="file">
@@ -74,31 +71,30 @@
 							<span class="default">Select Bandersnatch video file ( 5:12:14 ) </span>
 							<span class="success">Great, your file is selected</span>
 							<ul class="file-tips">
-								<li>this player only work on google chrome ( on firefox dont work , codec problem,test
-									other browser ?)</li>
-								<li>download Bandersnatch video file ( 5:12:14 )</li>
-								<li>drag it on white box on page :)</li>
-								<li>Persian , English , Arabic , Spanish , Hebrew ,Portuguese ,Greek ,Turkish ,Polish ,Indonesian
-									subtitle available , if you want add another language
-									subtitle , tell me</li>
-								<li>to change subtitle : right click on video , enable show controls , after that . on
-									bottom,right you see
-									<span class="menu-item"></span> ,then you can subtitle section </li>
-								<li>Note : after change subtitle , disable show controls ,if dont disable it on full
-									screen video,you cant see
-									option selector</li>
-								<li>tested with Black.Mirror.Bandersnatch.2018.720p.WEB-DL.x264.DUAL.mkv file</li>
-
+								<li>This player is known to work only on Google Chrome or Chromium.</li>
+								<li>Obtain the Bandersnatch video file (duration should be 5:12:14).<br>
+									Tested with <code>Black.Mirror.Bandersnatch.2018.720p.WEB-DL.x264.DUAL.mkv</code>.</li>
+								<li>Drag it on top of this box (or click here to select it).</li>
+								<li>Subtitles in many languages are available.</li>
+								<li>To change the subtitle:
+									<ol>
+										<li>Right click on the video</li>
+										<li>Enable "Show controls"</li>
+										<li>Click on the <span class="menu-item"></span> in the bottom-right</li>
+										<li>Select the desired subtitle</li>
+										<li>You can now hide the player controls in the same way as step 1-2.</li>
+									</ol></li>
+								<li>Note: do not use the "full screen" button in the video player if you enable "Show controls".
+									Choice selection interface will not be visible if you do this.</li>
 							</ul>
 
 							<ul class="controls-tips">
-								<h6>controls tips</h6>
+								<h6>Keyboard controls</h6>
 								<li><kbd>F</kbd> - Toggle fullscreen</li>
 								<li><kbd>R</kbd> - Restart video</li>
-								<li><kbd>→</kbd> - Jump to the next segment (or to the next interaction zone)</li>
-								<li><kbd>←</kbd> - Jump to the previous segment (or interaction zone)</li>
+								<li><kbd>→</kbd> / <kbd>←</kbd> - Jump to the next / previous segment (or interaction zone)</li>
+								<li><kbd>↑</kbd> / <kbd>↓</kbd> - Speed up / slow down playback</li>
 								<li><kbd>Space</kbd> - Toggle play and pause</li>
-
 							</ul>
 						</div>
 					</div>
@@ -127,8 +123,6 @@
 							src="subtitle/Czarne.lustro_.Bandersnatch.WEBRip.Netflix.pl.vtt">
 						<track label="Indonesian" kind="subtitles" srclang="en"
 							src="subtitle/Black.Mirror.Bandersnatch.2018.WEBRip.x264-NoGRP-Indonesian-vtt-sharp.vtt">
-
-
 					</video>
 					<div class="controls">
 						<div id="choiceCaption"></div>