[QUOTE=bsquared;442759]My suspicions confirmed. Thank you for your testing - I'll get it fixed.[/QUOTE]

I have found the bug. In the latest msieve, the field which_gpu in the definition of msieve_obj has moved above the field cache_size1. If I modify the definition of msieve_obj in factor.h accordingly, the problem is resolved.

I suspect that you already knew where to look. :smile: