[popcornmix]

(edit) delete all '.fi' files in temp folder, problem is gone. Thank you!

Actually I've seen that has been needed a few times with nightly builds.
They are cache files which I think can become invalid when a PR gets modified (as often happens when they are pulled into these builds before merging).

I wonder how much cost you'd suffer from deleting them on each boot? If it's negligible it might be worth doing this on each boot (or each update).