I'm seeing a strobing effect during playback of clips and timeline in FCP7. How do I fix?

I'm seeing a strobing effect during playback of clips and the timeline in FCP7. Footage isn't corrupt. Apple techs said its not hardware after their tests at the Apple store. I did a full reinstall of FCS. There's 4GB of RAM free at all times during playback. The problem is still there... How do I fix this?
Strobing:
By strobing, I mean there's only about 1 ever 10 frames playing back for me. Everything is rendered and the comp settings match the clip settings. It's not constant though, but the strobing is triggered at certain points on the timeline and effect a few clips after that (10 seconds or so at a time), and then when the next clip is displayed on the timeline the strobbing stopps and is reset back to normal playback... until another random clip is encountered by the playback head to which then the process repeats. Also, when strobbing is happening and I move the playhead back a few seconds, or pause & play, or even forward a little on the same strobbing clip (basically when i inturrupt the playback process) the strobbing STOPS! I can watch the same footage that was strobing without it strobing any longer until I move back the playhead far enough and try again, then the strobing is triggered again. I hope this all makes sense, it's very picular and I've seen or heard of nothing like it in my 4 years of editing in FCP7.

SStrange my enough the problem started occurring a few hours into the project. The only thing I can think of is that I shot with all Canon 5D mark iii footage when I usually shot with a mark ii. My workflow hasn't changed and I have never had this problem. I've also used other mark iii footage in the past without a problem but I don think I've edited entirely with mark iii footage

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I'm seeing a strobing effect during playback of clips and timeline in FCP7. How do I fix?

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