Here's the issue. I'll have a clip in a sequence of 10 video tracks or so. I'll edit the edge of a clip to make it shorter. However, one frame from the original clip length persists and flashes by whenever I play it even though it's not on the timeline. Deleting the clip from the timeline and then putting it back on doesn't fix the issue.
Moved this post to the Premiere Pro forum. They will be able to help you here.
Did you expand the timeline and closely check all tracks for a sliver of a clip left somewhere?
Do you have a transition on it, perhaps without enough handles?