Having sort of the same problems. I can't even send the data to the cutter. I'm running Mac OS 10.6.4 (New 27" iMac) with a copam cutter using Flexi 8.5v2. I also have the keyspan that has been suggested by almost everyone on here as well as the 9-25 pin adapter. I've also downloaded the Sentinel Driver, but I still get the "Cannot Find Driver" prompt when I try to cut. Please if there's anyone that could help, it would be greatly appreciated. I've been working on this 8 hours a day for about a week now.