I have a problem with playback. It will only play one frame and then stop

Hello people. After changing some settings with OBS I am having a problem. Any video in the timeline will only play the first frame and sometimes it keeps going if I leave it for 5-10 minutes.

I have tried to use 1/4 resolution in the playback tab and it does not seem to change anything so I believe it's not a gpu issue (the fans don't kick on either)

I am using MKV files with AOM AV1 which is the change I made for some other reasons.

Anything else you need let me know just I am not familiar with resolve much