27" iMac won't play multiclips correctly

Hi All,
I am trying to use a multiclip sequence in FCp with my 27" i7, and when I start playing the sequence, everything looks fine, when I make my first cut, the image in the canvas and the preview freeze. The audio continues playing, I just see I still image. After a short time (10-30 seconds) the image comes back to where it should be and using multiclip works fine. The problem is that anytime I stop playing and start again, the same issue occurs.
In my very old G5 with a far inferior graphics card, I never had problems with multiclip.
Anyone have any clue??

For this current project it is stored on an external MyBook using USB. I have also tried doing multiclip using media on an external FW800 LaCie BigDisk and on the internal drive. All three ways provides the same issue. These drives are the same drives that I used on the old G5 without a problem.
I should also mention I am trying this with DV footage.

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