Noel, I used one of the built in projects for this. It was a "new" project in that I had never tried this particular function before import/export standard 16bit/44.1 stereo wav files.
I filled out the crash report and sent that with the info and my e-mail address after one of the crashes. I've never gotten any response from Cakewalk from the crash report.
I suspect the problem may be just a bad install of Sonar as I did a complete, clean (reformat hard drive) install of Win 7 64bit less than two weeks ago. I did a complete install of Sonar X2, including addons such as Concrete Limiter and other 3rd party software such as Ozone 5. As I can't duplicate the problem in Win 8, that leads me to believe that a uninstall (restart PC) and then reinstall should correct the problem.
I'm a computer tech and keep a "very clean" PC. Minimal in the Notification area (used to be Systray) and in startup.
I wouldn't have marked this as solved until I do the reinstall and confirm its fixed. It still could be some type of issue with Sonar and Win 7.