No player controls for streaming player on OS X

Hi,

I'm trying to stream Live TV from the verizon website (tv.verizon.com) on OS X El Capitan. The streaming Flash player loads, but the controls do not. So I can't put the player in full scrren mode, or pause, etc. I've tried using Safari and Chrome. What's strange is that there's a "broken image link" icon to the left of the player. I'm not sure if that's a symptom of the problem or not.

This all works fine on Windows 7 using Chrome.

Any idea what's wrong or how to get the player controls?

Thanks!