Well, that's a big negative.
Did a complete system wipe this afternoon, installed 2.1 drivers on a fresh Mountain Lion install (10.8.5) and no dice. My DisplayLink monitor worked for about ten minutes, then back to the black screen. Tried uninstall and reinstall, no dice, then tried 2.0 drivers as well.
Nothing.
Wasted a pretty good amount of time, money and energy at this point and I think I'm just going to send this adapter back