I run Sonar X2 64bit. I have not had trouble running SampleTank; however, I rarely use it. My reason is not crashes, but eyesight. The GUI is too small to see. When I need to use it, I invoke the Windows Magnifier; but I this inconvenience is just a deterant and I usually turn to some other synth or sampler.
I was very disappointed to read in another thread on this subforum that SampleTank 3 will not be out until next year. I plan on just not using the ST2.5 very much until ST3 and 64bit is here. There are just too many other good and stable and GUI readable alternatives like Kontakt or Alchemy. As someone on another thread remarked, IKM is falling behind with ST3 delays, and when or if they ever do release it, one wonders if they will have waited too long for some to stay with them. I do not like to bash IKM, but this prolonged, extended, ongoing, waiting, and waiting for years now for ST3 is a delay that is absolutely ridiculous and unwarranted. If other companies went 64 bit, why has it taken so long for IKM to do so unless it is just not a priority for them; they are loosing customers.--There--that's my rant.