Local vs. network vs. server - Makes no file input or result output difference in any combination of listed data sources or output destinations. Tested each combination as administrator with full control permissions.
Error - It throws a generic 999999 after Not Responding for ~2 to 8 hours. Since the error was generic, I did not keep a screenshot. I think it may have been the Invalid Topology Out of Memory flavor of 999999. All machines have plenty of RAM, but only 4GB can be addressed due to 32-bit. Still, I’ve tested with a ~1,000 sq.ft. two-part polygon after repairing geometry. Nada.
Background vs. foreground - Tried both.
All tests work on a few old legacy XP machines, and the couple of 64-bit W7 machines we have.