I found that if I didn't have my OSBOT web camera connected, or if I disabled OSBOT audio in Windows settings, that capture would show screen unavailable. I wonder if you need at least a microphone connected. In addition, the user interface is not working like it should. It may say screen unavailable, but clicking on the disabled looking item will wake up the interface, after which it will show screen available, and you can click on the Capture (record) button. But in all cases, I need my webcam plugged into my computer.