I have an intel 965 as well and I can reproduce the freeze immediately by just enabling reflection AND setting the checkbox "reflection for windows". Latest karmic updates by today. Magic SysRQ "REISUB" still works - after reboot I manually change ~/.config/compiz/... config file and was able to log in again, otherwise the screen would have frozen again directly after login when compiz started.
I have an intel 965 as well and I can reproduce the freeze immediately by just enabling reflection AND setting the checkbox "reflection for windows". Latest karmic updates by today. Magic SysRQ "REISUB" still works - after reboot I manually change ~/.config/ compiz/ ... config file and was able to log in again, otherwise the screen would have frozen again directly after login when compiz started.