Crash report sent.
I've tried a few more things like turning off the BoxCryptor file viewer; the result is that if I view a file in another app and return to BoxCryptor, it works if the tablet is in the same orientation as before (even if I rotated it in the other app and then rotated it back before going back to BoxCryptor) but crashes if the tablet is in the other orientation (for example, if I use BoxCryptor in landscape mode, view a file in another app, rotate to portrait mode, and return to BoxCryptor while still in portrait mode, it crashes -- if I use BoxCryptor in landscape mode, view a file in another app, rotate to portrait mode, rotate back to landscape mode, and return to BoxCryptor in landscape mode, it works).
Again, I'd recommend having the settings screen, the file browser, and (especially) the file viewer all be full-screen, similar to the way the app runs on phone screens (and on the tablet in the Classic version) -- I find it more useful to have a bigger view of the pane I'm actually using than to have all three taking up screen real estate.
