Comment 5 for bug 408644

Ukytreats: I installed XFCE CE (dev-18) in a VM, so although I still cannot reproduce it (vbox 2.2 doesn't support compiz), I do notice that right underneath the enable compiz button is one for enabling compiz on boot, which should add the equivalent of compiz --replace to the startup, hence solving your reboot issue. Assuming the original issue still exists, I have updated the bug report to more accurately describe the problem, and will invite the XFCE maintainer to examine it.