Thanks for your response. But I think u misunderstood me a bit. I am editing mixed martial arts DVD’s. This event i am doing now has 17 fights. So I turned each full tape into sublclips of each fight. So since i have 3 cams, i have 3 subclips for each fight. I used an inpoint to make a multiclip of all 3 subclips. Instead of nesting sequences, i use one sequence. I lay 1 multiclip at a time in the sequence to “edit” or cut to the angles that i want. The problem im having starts after i edit or cut 1 multiclip. The next one will lock up in the viewer and i will get that error message. This is only the second fight i have use FCP for. I just switched over from Premiere Pro. But the last fight went without any of these errors or problems. Hopefully this cleared it up a bit. Thanks again.