I have had definite compatability issues with the AMD processors. With the K6 200, I couldn't even get the computer to recognize the CD!!!
At that time, National Instruments did say that there were definite compatability issues with the AMD processors. I don't know if they resolved these issues, or if new issues have popped up with these new processors, but I strongly suspect that this is your problem (considering that you did move from an Intel to an AMD, there can be no other reason.
Contact NI and ask them (ni.com/ask) about this. Until then, or if there is an issue, I suggest sticking with the tried and true Intel processors.
Good luck, and please update this post with your results. This information is archived for future searches.