I don't use AdobeViewer, so I can't comment on that aspect or your post, but I do use Cleanlook and my PB360 crashes/freezes A LOT. For instance, if I leave my reader on instead of turning it off every time I finish reading, I'll come back later and it will have rebooted itself and thrown me out of FBReader and I'm back at the main menu. Every time.
While reading (I only use FBReader) I'll go to turn a page and my reader will reboot. This happens a couple of times a day.
I hope it's not the themes, because I LOVE Cleanlook. I love the Easy view for my bookshelf.