Are you talking about live wallpapers? That is currently disabled for now: https://github.com/Onskreen/cornerstone/issues/5
Yeah, the clock freezing is a known issue. It's not as bad as it was before, but I still get it occasionally too. It's on my to-do list.
Actually my bug is regular wallpapers :-\
I use Quickpic as my gallery, and trying to set a wallpaper with it FC's it. It crops pics better than the stock gallery is why I use it. Also, app like "aLogcat" and "Andchat" are force closing if I try to go in their settings, but I don't know if its this rom or not. My only other device is my Epic 4G which is on CM9, and it doesn't have those issues. But it could be these apps, I just don't know yet.
Edit: and more apps "settings" or "preferences" sections are causing FC's, which is making me think its the ROM.
~E.R.A.