Both screen shots below are from the same phone, same TB version, same account, etc. They were taken only a few minutes apart during the same, ongoing, TB session. This is TB 13 off Play Store (not beta). Quite frankly, I dislike the hierarchical (which I see ONLY on my 2 gmail accounts - not in either Outlook or Yahoo - thankfully) and would much prefer the non-hierarchical all the time as it is consistent across accounts and takes less effort to get at folders like Sent and Trash - which are hidden/buried in hierarchical views. What I don't understand is why/how the same gmail account shows folders in both hierarchical and non-hierarchical. It was my impression that hierarchical was introduced as an "improvement" at some point between K9 and now. Is this a bug? Am I doing something to make this happen? If so, how can I do it again to make it non-hierarchical all the time :-) Thanks!