I have been using TB Android for some time now. I saw the update to 11.1 from my current 10.1 this morning. So I jumped on it with excitement! Suffice it to say that, thanks to my rooted phone and Neo Backup, I have returned to 10.1... My main problems are with the "hierarchical folders" - especially in gmail, which is the only place I see these bad changes (I have outlook and yahoo accounts as well): 1. There should be an option to turn use of "hierarchical folders" OFF in an account. I sure don't see that. 2. If "hierarchical folders" are to be insisted-upon, the state of opened folders in the hierarchy should be persisted - at the very least within a given TB session - but it would be more ideal across TB sessions. 3. If you tap on the un-opened "hierarchy" folder, you get a completely worthless page (see attached). WTH? 4. There should be a way to indicate that a given "hierarchy" folder should NOT be hidden in the drop-down but should be placed at the top, outside the hierarchy. Would would have hoped that the "Show At Top" setting in the Manage Folders would do this, but it does NOT. I didn't go much beyond this. I realized right then that this was not the update for me. So I tried to use the back button to return from TB to the launcher's home page (so I could go to Neo Backup and recover). Guess what? The back button no longer exits from TB to the launcher in 11.1 as it did in 10.1. I sure did not see this in the release notes. This is a shame really.