I have exported my video from Premiere Pro three times now, and it keeps showing this glitch in the same area each time. The area that it glitches on is a sequence of photos over a black video. These are the only photos in the video that seem to do this after exporting (H264, high bitrate). My project is due tonight so any help is greatly appreciated!
That's normally a GPU type issue to produce something like that. For speed of resolving this, you might try going to the Project settings dialog and setting Mercury Acceleration to "software only". Cutting out your GPU might slow export a bit but if it gets it past this, you at least have your export.