I have not fully testes my duel adapter. I know you are supposed to reboot each time you reinsert your P2 card.
“Notice to Customers Running Mac OS X: Due to a peripherals management limitation in Mac OS X, your MacBook Pro or other Apple computer must be restarted before reinserting the DuelAdapter into the ExpressCard card slot on your computer. We are actively working with Apple and expect to have this situation corrected in a future Mac OS X release.”
Steve Eisen
Eisen Video Productions
Director-At-Large
Chicago Final Cut Pro Users Group