diff --git a/ui/bookmarks.js b/ui/bookmarks.js
index 84719208..ec3adc3e 100755
--- a/ui/bookmarks.js
+++ b/ui/bookmarks.js
@@ -131,6 +131,7 @@ var saveFileBookmarks = makeFileSaver(
 
 function bookmarksUpdated(){
 	fileUpdated('Bookmarks')
+	$('.viewer').trigger('bookmarksUpdated')
 }
 
 
diff --git a/ui/data.js b/ui/data.js
index eed1c543..ff462e3f 100755
--- a/ui/data.js
+++ b/ui/data.js
@@ -884,7 +884,7 @@ function makeGIDBeforeGetterFromList(get_list, restrict_to_ribbon){
 		ribbon = ribbon == null && restrict_to_ribbon == true 
 			? getGIDRibbonIndex(gid) 
 			: ribbon
-		var list = get_list()
+		var list = get_list(ribbon)
 		if(list.length == 0){
 			return null
 		}
@@ -1325,7 +1325,7 @@ function makeNextFromListAction(get_closest, get_list, restrict_to_ribbon){
 	get_list = get_list == null ? getRibbonGIDs : get_list
 
 	return function(ribbon){
-		var list = get_list()
+		var list = get_list(ribbon)
 		if(list.length == 0){
 			flashIndicator('end')
 			return getImage()
diff --git a/ui/files.js b/ui/files.js
index 54bd0678..28391095 100755
--- a/ui/files.js
+++ b/ui/files.js
@@ -312,6 +312,7 @@ var saveFileData = makeFileSaver(
 function dataUpdated(){
 	if(!isViewCropped()){
 		fileUpdated('Data')
+		$('.viewer').trigger('dataUpdated')
 	}
 }
 
diff --git a/ui/keybindings.js b/ui/keybindings.js
index a87b5019..7276a201 100755
--- a/ui/keybindings.js
+++ b/ui/keybindings.js
@@ -590,6 +590,18 @@ var KEYBOARD_CONFIG = {
 				function(){ prevBookmark() }),
 		']': doc('Next bookmarked image', 
 				function(){ nextBookmark() }),
+		',': {
+				default: doc('Previous marked image', 
+					function(){ prevMark() }),
+				shift: doc('Previous unmarked image',
+					function(){ prevUnmarked() }),
+			},
+		'.': {
+				default: doc('Next marked image', 
+					function(){ nextMark() }),
+				shift: doc('Next unmarked image',
+					function(){ nextUnmarked() }),
+			},
 		'{': doc('Previous unsorted section edge', 
 				function(){ prevUnsortedSection() }),
 		'}': doc('Next unsorted section edge', 
diff --git a/ui/marks.js b/ui/marks.js
index 6ae6fd51..f11b75df 100755
--- a/ui/marks.js
+++ b/ui/marks.js
@@ -13,6 +13,10 @@ var MARKED_FILE_DEFAULT = 'marked.json'
 var MARKED_FILE_PATTERN = /^[0-9]*-marked.json$/
 
 
+// NOTE: if this is set to null, caching will be disabled...
+var _UNMARKED_CACHE = {}
+
+
 
 /**********************************************************************
 * helpers...
@@ -61,12 +65,61 @@ function _removeMark(cls, gid, image){
 }
 
 
+// Invalidate unmarked image cache...
+//
+function invalidateMarksCache(){
+	if(_UNMARKED_CACHE != null){
+		_UNMARKED_CACHE = {}
+	}
+}
+
+
+// Get list of unmarked images...
+//
+// mode can be:
+// 	- 'ribbon'
+// 	- 'all'
+// 	- number			- ribbon index
+// 	- null				- same as all
+function getUnmarked(mode){
+	mode = mode == null ? 'all' : mode
+	var gids = mode == 'all' ? getLoadedGIDs() 
+		: typeof(mode) == typeof(123) ? getRibbonGIDs(mode)
+		: getRibbonGIDs()
+	mode = mode == 'ribbon' ? getRibbonIndex() : mode
+
+	// get the cached set...
+	if(_UNMARKED_CACHE != null && mode in _UNMARKED_CACHE){
+		return _UNMARKED_CACHE[mode]
+	}
+
+	// calculate the set...
+	var res = gids.filter(function(e){
+		// keep only unmarked...
+		return MARKED.indexOf(e) < 0
+	})
+	if(_UNMARKED_CACHE != null){
+		_UNMARKED_CACHE[mode] = res
+	}
+
+	return res
+}
+
+
 var getMarkedGIDBefore = makeGIDBeforeGetterFromList(
 		function(){ 
 			return MARKED 
 		})
 
 
+// NOTE: this is not too fast as it will filter the marked images...
+// NOTE: this is restricted to current ribbon...
+var getUnmarkedGIDBefore = makeGIDBeforeGetterFromList(
+		function(ribbon){ 
+			return getUnmarked(ribbon)
+		}, true)
+
+
 // Make a mark toggler
 //
 // The toggler will:
@@ -485,6 +538,17 @@ var prevMark = makePrevFromListAction(
 		function(){ return MARKED })
 
 
+var nextUnmarked = makeNextFromListAction(
+		getUnmarkedGIDBefore, 
+		function(ribbon){ 
+			return getUnmarked(ribbon == null ? 'ribbon' : ribbon) 
+		})
+var prevUnmarked = makePrevFromListAction(
+		getUnmarkedGIDBefore, 
+		function(ribbon){ 
+			return getUnmarked(ribbon == null ? 'ribbon' : ribbon) 
+		})
+
 
 
 /**********************************************************************
@@ -604,6 +668,8 @@ var saveFileMarks = makeFileSaver(
 
 function marksUpdated(){
 	fileUpdated('Marks')
+	invalidateMarksCache()
+	$('.viewer').trigger('marksUpdated')
 }
 
 
@@ -640,6 +706,9 @@ function setupMarks(viewer){
 				viewer.trigger('togglingMark', [gid, action])
 			})
 		})
+		.on('baseURLChanged', function(){
+			invalidateMarksCache()
+		})
 }
 SETUP_BINDINGS.push(setupMarks)
 
diff --git a/ui/tags.js b/ui/tags.js
index ea8217b6..b2cfa320 100755
--- a/ui/tags.js
+++ b/ui/tags.js
@@ -495,6 +495,7 @@ var saveFileTags = makeFileSaver(
 
 function tagsUpdated(){
 	fileUpdated('Tags')
+	$('.viewer').trigger('tagsUpdated')
 }