i am having a similar problem with FCP on a Dual 2GHZ G5 2GB Ram seperate Media drive capturing DV only. It started with FCP not seeing the Deck at all. I reinstalled FCP and quicktime and it now saw the deck but reports dropped frames after about 20 seconds. The strange thing is that Avid on the same system could see the deck all the time and doesn’t drop frames.
Assuming that there was some sort of OS problem i have formated the system drive and reinstalled the OS and FCP and Avid. Again Avid has no problems but FCP drops frames. This system was working fine for 2 years. I have 5 other systems with the same configuration all running fine with no problems.
Any suggestions?