How to prevent frozen video (in both clip previews and exported videos)?

When imported into iMovie, some video clips do not show preview information when you scroll over them. They simply do nothing and stay on a frozen frame. After exporting a project with one of these clips in the timeline, when the clip should clip the video freezes on that one frame while the audio plays until the clip is over. I have tried converting these videos into several other formats, codecs, resolutions, bit rates, etc, with no success. A video that freezes in iMovie, always freezes in iMovie (or freezes when exported) and I can't find any solution to make these clips play when assosated with iMovie.
The clips playback file before importing into iMovie.
OS X 10.7.5
iMovie 9.0.8

Hi aalincoln,
I had a similar problem. For me it was because my memory was reaching it's limits, not the space on my harddrive. I closed all other programs to make sure iMovie has all the memory it needs and played/export the clips again and it worked.
Try downloading Memory Clean or another solution to see your current memory usage.
Hope this helps!
Succes!
Frans

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