diff --git a/ui (gen4)/features/base.js b/ui (gen4)/features/base.js
index 8db51cc1..9e79d35c 100755
--- a/ui (gen4)/features/base.js	
+++ b/ui (gen4)/features/base.js	
@@ -691,6 +691,7 @@ core.ImageGridFeatures.Feature({
 
 				var img = images.Images(json.images)
 
+				// this is needed for loading multiple indexes...
 				if(base_path){
 					d.base_path = base_path
 					// XXX STUB remove ASAP... 
@@ -704,6 +705,7 @@ core.ImageGridFeatures.Feature({
 					// 			2) add/remove on load/save (approach below)
 					// 				+ less to do in real time
 					// 				- more processing on load/save
+					//console.warn('STUB: setting image .base_path in .prepareJSONForLoad(..)')
 					img.forEach(function(_, img){ img.base_path = base_path })
 				}
 
diff --git a/ui (gen4)/features/collections.js b/ui (gen4)/features/collections.js
index f3555340..f1616497 100755
--- a/ui (gen4)/features/collections.js	
+++ b/ui (gen4)/features/collections.js	
@@ -60,6 +60,9 @@ module.COLLECTION_TRANSFER_CHANGES = [
 ]
 
 
+
+//---------------------------------------------------------------------
+
 // XXX undo...
 var CollectionActions = actions.Actions({
 	config: {
@@ -1331,7 +1334,8 @@ module.Collection = core.ImageGridFeatures.Feature({
 				// 		simplify lazy-loading of the collection 
 				// 		index...
 				if(changes && (changes === true || changes.collections)){
-					var index = res.index['collection-index'] = {}
+					//var index = res.index['collection-index'] = {}
+					var index = res.index['collections'] = {}
 					// NOTE: we do not need to use .collection_order here
 					// 		as .json(..) returns the collections in the 
 					// 		correct order...
@@ -1400,9 +1404,10 @@ module.Collection = core.ImageGridFeatures.Feature({
 				// collection index...
 				var collections = {}
 				var collections_index = {}
-				var index = json['collection-index']
+				//var index = json['collection-index']
+				var index = json['collections']
 				index
-					&& index.forEach(function(gid){
+					&& Object.keys(index).forEach(function(gid){
 						var title = index[gid]
 						var path = 'collections/'+ gid
 
@@ -1415,6 +1420,12 @@ module.Collection = core.ImageGridFeatures.Feature({
 						}
 					})
 
+				if(Object.keys(collections).length > 0){
+					//console.log('!!!!!', collections)
+					// XXX this breaks loading...
+					//res.collections = collections
+				}
+
 				// group collection data...
 				// XXX would be nice to have a mechanism to pass info to 
 				// 		the loader on what paths to load without actually 
@@ -1691,7 +1702,7 @@ module.CollectionTags = core.ImageGridFeatures.Feature({
 					// skip loaded collections that are already Data objects...
 					// XXX not sure about this...
 					.filter(function(title){
-						return !(json.collections[title] instanceof data.Data) })
+						return !(json.collections[title].data instanceof data.Data) })
 					// do the loading...
 					.forEach(function(title){
 						var c = that.collections[title]
diff --git a/ui (gen4)/features/location.js b/ui (gen4)/features/location.js
index f9943507..30597acf 100755
--- a/ui (gen4)/features/location.js	
+++ b/ui (gen4)/features/location.js	
@@ -340,10 +340,23 @@ var LocationActions = actions.Actions({
 		}}],
 	load: [function(){
 		return function(_, data){
+			var that = this
+
 			// NOTE: we are setting this after the load because the 
 			// 		loader may .clear() the viewer, thus clearing the
 			// 		.location too...
-			this.__location = data.location
+			var l = this.__location = data.location
+
+			// set default image .base_path
+			// XXX not sure we need this...
+			data.location
+				&& Object.keys(this.images || {}).forEach(function(gid){
+					var img = that.images[gid]
+
+					if(img.base_path == null){
+						img.base_path = l.path
+					}
+				})
 		}}],
 	clone: [function(){
 		return function(res){
diff --git a/ui (gen4)/imagegrid/file.js b/ui (gen4)/imagegrid/file.js
index 74e44a16..4bed16e6 100755
--- a/ui (gen4)/imagegrid/file.js	
+++ b/ui (gen4)/imagegrid/file.js	
@@ -278,6 +278,8 @@ function(list, from_date, logger){
 					var k = s[1]
 					var d = s[2] == 'diff'
 
+					k = d ? k : s.slice(1).join('-')
+
 					// new keyword...
 					if(index[k] == null){
 						index[k] = [[d, n]]