I had a problem with the scheduler asking for ATI wu even though the project runs Cudas. I redid 6.12.34 and it didn't help. I finally did a detach/attach and now the caches are full and staying that way. It now asks for the right type of wu.
Edit: that was happening on all 3 of my boxes running both ATI and Cuda cards. The dual Nvidia didn't have any problems.