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OK, a workaround: If I uninstall the USB serial dongle driver on OS X, Parallels can see the dongle again. That's a stupid fix, though. Is...
Parallels Desktop 3.0 build 5584, OS X 10.5.2, 15" MacBook Pro I use an IOgear GUC232a USB serial dongle both with OS X and with a Windows XP...