I'm not sure why it worked before but doesn't now except to say that the file format the Flip cameras use is problematic for Premiere Elements at times. Your best bet may be to convert the Flip files first using Windows Movie Maker. The following thread has the steps to do this:
>What am I missing that I had before formatting?
Use the FREE http://www.headbands.com/gspot/ to read the codec used in that file
My guess would be that you had "something" installed before that you have not put back after the formatting
This is a mess! I had to go through all that just so PE7 could see the video. (Seems I can't load IE anymore and I don't know why, but that's another rant.)
I opened the video in Quicktime - window - movie inspector and noticed it's format is listed as 3ivx MPEG4 5.0.3. I'm gonna search "forums.3ivx.com" and see if there is a way to get this thing back to what I had. If I could do it before then I'll figure out how to do it again!
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Ah, the 3ivx codec. Why didn't you say that in the first place! That's video from one of those cheap Flip cameras, isn't it?
We've got an article on it in the FAQs to the right of this forum.
There's also this possible solution, from the Tips & Tricks area.