Kostya,
I just encountered a bug that is not critical but rather annoying.
Synopsis: message view, the message has attached photos (.jpg).
If I am in the "Attachments" tab, and then change the orientation of the phone (between landscape and portrait), AqM jumps to the "Message" tab.
Observed on Droid Razr M with Android 4.1.2, AquaMail 1.5.1.12.
Please, let me know if any additional information is needed.