Can you please describe your setup in greater detail? Also please create a copy of your current OBS shortcut, then with teh new copy, edit it to say this in Target:
"C:\Program Files (x86)\obs-studio\bin\64bit\obs64.exe" Files (x86)\obs-studio\bin\64bit\obs64.exe --verbose --log_unfiltered --unfiltered_log
Copy it exactly as you see it into the "TARGET" line removing the original text, then hit apply and right click this link you just created, and start it as Administrator. After this is the case, and it is started, First thing do whatever you need to do to make it show/say that video output is currently being used. Then try to start a short 30 second stream, then end it, then start a 30 second recording then end it. ONce finished, close obs. Copy the last 2-3 logs from %AppData%\Roaming\obs-studio\logs (you can get to that folder via Explorer or typing that into a WIN+R Run Box.)
Then send us those last few logs. Thanks!