Next time you see a video at forum not playing for you and showing circle or something else, please press F12 on your keyboard (applies to non-mobile devices only), refresh the page, make sure you see the same video which you could not play, and try to play it again. Now navigate to “Console” tab in the pane which opened for you once you pressed F12 button. Please see what messages you get there, these may tell something important on why something is not working correctly. This applies to ANY web page in the Internet, but let’s diagnose the problems you experience with VHTV Forum first then, while we’re discussing it