Exporting stuck at 100%

I've been trying to figure this out for 15 hours. All of my h.264 4K sequences get all the way to 100% then stop. I've tested this with 8 different sequences. All are 60+ minutes. Doesn't seem to happen to shorter 5-10 minute videos. Tried exporting through Premiere Pro and it worked great until 5 videos in, then it started doing it there as well.

I'm so unbelievably frustrated. I have over $1200 on the line for this project and I'm 2 days late because of this issue.

HELP!!!!!!!!!!!!!!!!!!!!!!!!!!!!!