Update your GPU driver. You are using 295, which is very out of date. Go to the Nvidia site and download and install version 304.
I just bought a retail Quadro 4000 Mac and it's running driver 256!
I don't have personal experience with 256, but I have seen many problems with 295 that are solved with 304.
Looks like the driver update solved the problem.
I had to upgrade to Mountain Lion as my OSX was version 10.7.5, and the 304 driver required 10.8
I can now use CUDA in AE and Premiere.
Thanks for the help.