If you are attempting to use Streamlabs via window capture in either version of OBS you may stumble into the issue of having it appear as a black screen instead of the normal green screen.
To solve this issue: in chrome click the 3 horizontal bars in the top right and click settings. (Or type chrome://settings in the url bar)
Scroll down to "show advanced settings" then scroll towards the bottom and under "hardware" uncheck "use hardware acceleration".
If you need a visual here is webm to look for the setting