I've got the exact same problem with "Hard Drive Space Remaining" getting smaller. I'm running version 2.0.1 on OS 10.7.4. I was running a recording and it crashed after about an hour (computer was probably going to sleep. I'll have to change that). I started with about 76 gig available and now it says about 70. There is no file in the "Movie" folder. I can't find any sort of temp files. "Get Info" on my hard drive actually shows about 76 gig. I've tried deleting preference files from the library and reinstalling the app. Still getting a lower hard drive space remaining than what I started with.