I'm also experiencing small problems on my Touch (N905C) with bookmarks/annotations.
When I tried to remove a bookmark after updating to 3.8 (didn't know about the long press then, found that out later) I suddenly got the square smiley face and 4 flashing blocks and was back at the main menu. Not really a freeze, but some glitch.
(just noticed that there is a number of reports about bookmarks in the 3.8.0 formware thread, like
https://www.mobileread.com/forums/sho...2&postcount=58)
https://www.mobileread.com/forums/sho...&postcount=145
by the way, I can bookmark and un-bookmark by touching the folded corner - without using the annotations list in between - but using the list and unfolding gives a 'reboot'.