I have been using NIK, PhotoSuite 7 and PS CS6 for some time now and have not experienced any problems. About 2 weeks ago, installed the update Goggle version of the NIK software and it is still working. I run Windows 7 Pro 64bit. I use PS and NIK the most.
Not easy to troubleshoot this type of problem. Anything from a driver to some other app that uses a shared DLL can cause this problem. Hopefully doing a internet search might show others with a similar problem or maybe some here has had this can offer a solution that worked for him.
Have you tried resting your photoshop settings?
I took advantage of the recent sale and bought the NIK Collection, and I also purchaed Perfect Photo Suite 7. I installed NIK and everything went fine. Then, when I installed Perfect Photo Suite 7, it casued PS5 to crash, and PS6 to work only intermittantly. I went back and uninstalled PP Suite 7, and everything is back to normal. I already had Perfect Resize installed before the NIK Collection, and it didn't casue a problem, so I am wondering if NIK and PP 7, or PP 7.1, the updated version, cannot be installed together. BTW, I use Windows 7.