Have Streamlabs Desktop installed in Program Files (default install location).Right click the shortcut on your desktop and select 'Run as Administrator'.Delete the capture source, restart Streamlabs Desktop as administrator, and re-add the source.

So it can sometimes cause glitches if you enable the wrong recording settings.Follow these simple steps to fix your game capture source not working: Wrong capturing settings: OBS provides many recording options, like a specific recording area and full screen. This choice may harm running programs, and OBS may turn to the black screen. Dedicated Graphics Interfering: When you launch an application or a game, the operating system will determine whether to allocate resources from the dedicated graphics card or the normal motherboard-integrated graphics. This program may clash with OBS and trigger a race for resources, causing OBS to malfunction and not perform correctly. Conflicting Software: Other comparable capturing applications may be operating in the background. System upgrades might also cause compatibility problems. As there are two OBS versions available (32-bit and 64-bit), the one you installed may not be supported by your operating system. Compatibility Issue: Sometimes the OBS showing black screen may be caused by a compatibility issue. You can try disabling overlocking to recover from this situation. It can turn down your screen which causes you can’t see anything. Overlocking: Overlocking can boost your PC’s performance, but it also has adverse effects on the application. To solve this issue, you just need to start the tool after taking administrative access. Lack of Administrator Rights: If you are sharing the entire screen with OBS, there may be some situations where the computer restricts its access and then OBS cannot show you the contents. PC in an error state: If you leave your PC running for a long period, it might end up in an error state and hinder the overall performance, which may lead to the OBS Studio black screen issue.

Obs recording black screen