Hi Roel "Our problem turned out to be caused by a loss of precision in an application of ours, caused by Direct3D. The solution for us was to include the flag D3DCREATE_FPU_PRESERVE in CreateDevice(). The documentation seems to imply that the lower precision only has effect in the Direct3D code, but in reality it lowers precision in the rest of the code too (the whole process or the whole thread, I'm not sure). "
That is spot on and very likely the cause. Thanks very much for responding. I do have some control over the vendor and have passed that information on to them. Hopefully they will investigate and fix the problem. Bob -- http://mail.python.org/mailman/listinfo/python-list
