There is a really nasty bug for those using the Unity launcher at the bottom ( http://www.webupd8.org/2011/11/install-ubuntu-unity-bottom-launcher.html ): When running Ubuntu Tweak 0.6, then going to Tweaks > Unity Settings, Unity crashes (it completely freezes so I can't post an output/debug message) and the user is not able to login anymore, until he removes Unity Bottom Launcher and re-enables the default Unity launcher (which is very tricky) so please fix this as soon as possible…
Unity Bottom Launcher is an unofficial Unity plugin that can be enabled/disabled just like the default Unity Compiz plugin, but obviously it has a different name, so most probably this is why the bug occurs.
Thanks!
Thank you for your report. Already fixed, I just disabled it for the unity-rotated.
Please help to verify.