DLLs from CUDA 2.1 lead to freezing app

I recived many complains that new app build, distributed with CUDA 2.1 release DLLs, experiences unpredictable freezes during computations. :thumbsdown:
The same app distributed with DLLs from older CUDA version (2.0 perhaps) experienced much lesser amount of such freezes.

What is wrong with CUDA 2.1 x86 runtime DLLS ? :wacko: