All other DMX devices do work (for me, not sure about the OP)....Hmm...I thought I saw a trace from pin 7 to the ground on the 485 chip, but I'll have to look again. Some of the other dongles I was testing with (like RPM) definitely do so I may have mixed it up.
The images in the wiki appear to show a link from pin 7 to the ground of the RS-485 chip (think I have that right), but I'll check my actual board when I get home.