Projct sequence suddenly stops playing video!

Hi
I use FCP 5.1.4 on a Mac Pro twin 2.66 with 3gb ram I have a short but complex sequence to edit. After adding an effect to a clip in the timeline and then continuing to play the sequence I was horrified to see that the sequence would not play any video in the canvas, only the audio. If I double click the individual clips on the timeline so they open in the viewer - they play.Now, if I play the sequence it is fine up until the point where the problem first manifested, but beyond that point, everything goes black!!

I reverted the project just to get moving , it was a third party effect, but this has since happened again when doing some picture-in-picture stuff. I answer to the previous suggestion, it is nothing so basic, I even get wireframes displayed in the canvas and everything, but no image?!!! When I try to play it through external video, it displays the last frame that I paused on, until I pause again, but won't play the sequence.

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