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This is a bug, unfortunately. But it's been fixed in the development version so the next version of *Mathematica* will give the correct answer.
Can you share more of your code with us? Without those specifics, it is very hard to diagnose what could be going wrong.
You're welcome, glad to hear it! :)
I won't offer a judgement on the validity of your source, but if for some reason you really really want to redefine the value of Pi, you can do so: Unprotect[Pi]; Pi = 3; and then evaluating Pi will return 3.
CUDAResourcesInformation[] is usually pretty slow (about 10 seconds on my machine), although I'm not sure about the precise reason. CUDAInformation[] should not take long to evaluate, Energy Saver -> Automatic Graphics Switching Please let me...