I would have attached a video with proof but apparently this forum doesn't allow that :( (disabling pointer trails and all those things didn't work either) All these things I have done without success. Things I've already tried: Running OBS as an administrator, restarting computer, unplugging and re-plugging mouse, updates mouse driver, unchecked and re-checked capture mouse on my game capture, scowering youtube, the OBS forums, the minecraft forums for answers.
This is just irritating since it's very hard to play minecraft without seeing your mouse. OBS does seem to capture my mouse tho since when I watch back recordings made during this glitch do show my mouse. When I'm not running OBS and playing minecraft in fullscreen, my mouse is there when I need it but then as soon as I open obs, gone. I now can't see my mouse (not my cursor, my *mouse*) when I open i.e my inventory (in minecraft). I open minecraft, and put it in fullscreen. I know that was extremely hard to understand, here is a simplification: I have OBS running.
So I have an issue: when OBS is running at the same time as minecraft is, I can't see my mouse while i.e in my inventory (in minecraft) when I'm in fullscreen in minecraft.