That is just a warning and not the cause of the bars, I’ve got some fixes and improvements waiting on my disk but none of them solve the bar problem and as always during summer I can’t get anything done.
The problem is with the AO, I’ve got a topic here somewhere on it, but so far no help, idea or solution, I may need to take a look at how p3d is doing AO and do a Cg->GLSL translation… unless some has a working AO shader and is willing to share (I’m not going to steal AO from the Render Pipline, not for lack of trying, can’t find a thing there).