diff --git a/Viewer/features/core.js b/Viewer/features/core.js
index 85bb8f44..f855ccb5 100755
--- a/Viewer/features/core.js
+++ b/Viewer/features/core.js
@@ -2725,7 +2725,8 @@ function(title, func){
 //
 // XXX might be a good idea to split this into a generic and domain parts 
 // 		and move the generic part into types/runner...
-// XXX check if item is already in queue...
+// XXX check if item is already in queue (???)
+// 		...how do we identify item uniqueness??
 var queueHandler =
 module.queueHandler =
 function(title, func){
diff --git a/Viewer/features/sharp.js b/Viewer/features/sharp.js
index 2c9e19ce..8a764882 100755
--- a/Viewer/features/sharp.js
+++ b/Viewer/features/sharp.js
@@ -422,7 +422,6 @@ var SharpActions = actions.Actions({
 	// XXX should we split this into a session and global versions 
 	// 		a-la .makeResizedImage(..)???
 	// XXX this does not update image.base_path -- is this correct???
-	// XXX add support for offloading the processing to a thread/worker...
 	// XXX make index dir hidden...
 	makePreviews: ['Sharp|File/Make image $previews',
 		core.doc`Make image previews
@@ -700,10 +699,6 @@ var SharpActions = actions.Actions({
 											&& logger.emit('skipped', `${gid} / ${size}`)
 									}) })) })],
 
-	// XXX BUG: .cacheMetadata('all'): runs out of call stack on very 
-	// 		large indexes...
-	// 		...can't yet see/find any recursion...
-	// 		.....at least the fail is fast and quiet =)
 	// XXX add support for offloading the processing to a thread/worker...
 	// XXX revise logging and logger passing...
 	cacheMetadata: ['- Sharp|Image/',