I just read all your responses. I was having the same problem. I had a 5 minute timeline with a mixture of 24p and 60fps footage from a 5dMkiii and an s120. Every time I tried to copy the full sequence, which was set at 60, to a new timeline of 24p, the program would crash when I hit Ctrl+C. Like it was choking on all the clips being put into memory. I don't know why, but I figured I would try resetting the sequence, which deletes the sequence preview files (I think). So, I switched from DSLR to Arri, deleted all the preview files. After that, Ctrl+C worked, so I copied the whole timeline into the new sequence. Then I changed the sequence back to DSLR. It worked like a charm. Don't ask me why. But I think maybe what's happening is that somehow, the preview files get corrupt, which then makes it impossible to copy the bad data.
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