Export Video is broken

Unable to export .mp4 files, apparently the app is “incompatible” with that specific function. Still sort of exports .avi files, but instead of a working file, it gives me a 2GB turd of nothing.

exportissue

Another issue I get with both audio and video exports is I get a generic .file extension and I have to rename them to .WAV, .AVI or whatever extension it is.