One thing I have noticed that I don't like from this upgrade, is that my folders or hidden icons are reset after a reboot. I have added the folder icons and wallpapers as mentioned in 8800 OS thread, the file for 320x240 for 83xx, 88xx, 8700 devices. I don't know if that has anything to do with it or if it's just some kind of glitch.
Edit: I found this thread in the themes section: http://www.blackberryforums.com/medi...eme-4-5-a.html
which is the theme I am using. It must be only theme related.