Comment 4 for bug 154596

Same thing for me. A fresh install of 7.10 and everything seemed to be running fine. However, seemingly randomly, window decorations will just disappear. The other compiz functions (e.g. the desktop cube) still work okay, just the decorations from my emerald theme are gone. Logging out and back in, or rebooting, fix the problem. Nothing obvious in dmesg.

???

Ironically, this was more stable in Feisty with a manually configured compiz. :(