Flick paging seems harder to do than in earlier versions (?). I've got it set for right-to-left flicking. Seems like if I start the gesture too far to the right, it doesn't respond. Starting at midscreen works better. Backing up with a left-to-right flick doesn't seem nearly so touchy, seems to work well even starting at the far left.
On v0.21, I was having some difficult-to-reproduce-but-happened-more-than-once problems with the ?button bars? at top and bottom disappearing.
- Might have been related to using dictionary lookup.
- Might have been related to receiving an external notification.
- Might have been related to being in a spot with no network connection.
Is that vague enough?

If they disappeared, shifting back and forth to full screen mode did NOT fix the problem, but closing an ebook and reopening would. Occasionally, when the bars had disappeared, I'd see that notorious grey band at the bottom of the screen, I think after a dictionary lookup. Haven't seen any of this
yet in v0.22 - maybe fixed, or maybe I just haven't blundered into what the real cause is again?