Q: why can't i watch videos on comcast.net sight?

I don't know.  Is Comcast your cable provider?  In order for me to watch TV on Time Warner's website, I have to login with my cable account information.  Do you have to do that as well on Comcast's site? 

We need more to go on if we're going to help you.

What happens when you try?

flexster wrote:

 

I am signed into comcast and when I try to watch a top story video, It goes to the video

and looks like it's linking up to play  but nothing happens. no video shows. blank spot where video should be playing.

Have you tried emptying your caches/disabling all plugins and extensions?  You can empty your caches by going to Safari Preferences --> Advanced, then checking the box next to "Show Develop menu in menu bar."  After that, go to Develop --> Empty Caches.

Safari - Unsupported third-party add-ons may cause Safari to unexpectedly quit or have performance issues

Safari doesn't load a page or webpage items are missing

Safari/other browsers – Website not loading