LightDM corrupt without fglrx
I'm running an 11.10 system, and for some reason, LightDM always covers my screen with purple blocks without FGLRX installed. There's no problem with starting X, only LightDM. I have reinstalled Ubuntu multiple times from scratch only to have this problem over and over again. Even funnier, everything works like a charm when booting off the LiveCD, but when it's installed, LightDM becomes corrupt.
I tried adding "nomodeset" to GRUB but that ended up with LightDM not loading at all. Please help!