Manycam will not play any video file - black screen

I’m using manycam free version and I can’t get any video file to play in the preview window. I can click the pause/play button but its just black screen. it also won’t play any youtube video either. I can load a picture though. I’ve been searching on google but can’t find anything related to this problem. will manycam only play a specific video type? is this a limitation of the free version?

would appreciate some help

I am having the same issue and no one responds.
There is no information on Manycam and no technician responds

forget manycam - its dead. switch to obs studio its awesome and free