Okay. Take in timecode in and out information from the bad clips, open your log & capture window, type in the ins and outs and relog your clips and try capturing that way. It sounds like you have something set up wrong if you keep crashing and losing data. How is your equipment hooked up? What are you digitizing from and what are you digitizing to? IS your equipment set up properly?
Open up a completely new project and choose the appropriate easy set up and try and import the clips that way. Maybe your project is corrupted. It is always good to trash your preferences after a crash. Have you changed anything with the machine recently? When was the last time you had a really good dream? What time is it on Monday? Sorry it’s getting late and I have to sleep soon.
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G5 Dual 2Ghz <> 4GB RAM <> FCP 5.02 <> Kona 2
ATTO 42XS <> Huge Systems 1.25 TB 4105 Fibre