Is it just me or...

[[Unknown]]

First two are related. You don't have the assets, which I think are only included in the official builds (not the git builds.) Without them, you won't see fps/debug statistics, you won't see the save UI, you won't see prompts, etc.

I haven't tried screenshots in full screen but generally I've found screenshots in full screen mode to be iffy with games and emulators. Maybe there's a workaround/fix.

-[Unknown]