well color controls works with overlay 1 and 2
VMR9 uses overlay too I suppose though I'd better check that and in any case, color controls gives an error when using VMR9.
RGB overlay selection seems to be blocky with ATI hardware since build 806; (reported in the
3 bugs in 1.0 807 post, you're not 1st on it ;) )
you should be able to switch back to another video rendering mode by clicking 'continue' when the 'list index out of bounds' error appears instead of close. (works for me ;) )