After Effects CC 2015 not rendering my project.

I've rendered this same project multiple times, including a couple times today, while I add and/or change things. All were successful. Suddenly it's stopped rendering it completely. I add it to the render queue, hit render with all the same settings as usual and the progress bar just doesn't move, it says Elapsed: 0 seconds, and it gets stuck on the first frame. I didn't change anything since my last render besides a mask path for a single keyframe. I tried removing the keyframe and it didn't fix it, so clearly that must not be it. The only other thing I changed at all was a preview setting, to play audio even when it's not realtime. but i don't see how that could be it either. I have no idea what could be causing it since it was working fine until it just suddenly stopped.

I'm on windows 10. After Effects CC 2015. 

GTX 1080

i7-7700k

16gb g.skill ripjaw