The nighly build doesn't have the option to disable GD in raw video menu, does it? Try turning off GD manually before you start a raw recording, see if that helps with the pink plague.
I'd love to see development continue for 600D, especially in light of the dual iso capabilities. Seems like our little camera is an oddball, though. So much potential with just one limiting factor. I agree that newer cameras need more attention. If we can get .mlv ported to 600D I'd be satisfied, never imagined we'd get this far, honestly.