It's been a while, and my memory is fuzzy, but I recall either pyodbc or pysybase reacting very poorly with the multiprocessing module. With multiprocessing, Python would segfault after fork. With threading, it would "work" albeit slowly. Also, IIRC, it did not matter if the module was imported before or after the fork, still segfaulted. I never had the time to try and track down the issue that was causing it, though, deadlines and all that.
