I joined just to report this bug - did a whole recording session, only to find that the select options are not showing.
You can use 'Screen capture', but it is a major pain in the butt, since I then need to change my screen resolution down to 1080p. Solution for me was to switch to 'TapRecord' which doesn't have these issues.
Should add that this also affects the MAC version of OBS, so its not a Windows thing.