I'm glad to have found this thread, it's much more efficient to tag more posts onto this one than to start a brand new one. I just got some of these myself and the video passthru problem presents with both accelerators tested thus far.

First things first though: which is the correct driver on Newer's Legacy Download Page?

http://www.newertech.com/tech_support/support_legacy.php

It looks like Sonnet ran out of their version of these accelerators. :-/

I attempted to try the Sonnet Video Adapter with a Newertech 6100 Card, but they made it fit the full 6100 adapter board spec . . .

. . . the thing tried moon me by sticking its own tuschie out the @$$ end of the 81/110! 8-o

I'll have to set up the bare spare 81/110 board for testing that nasty combo! }