I have no clue, whether it's a problem caused by the video codecs used by bangbros or not (I'm not a member of the site), but in case you use Windows as OS: I sometimes have problems with browser embedded files when another media player is still active in the background. You could check if this problem occurs only when Windows Media Player, DivX Player or any other player is still running in the background.
Edit: And as Fairchild said, VLC player is always a safe alternative. Normally, you can bank on this (compared to many other players) small and performance friendly tool.