There is no definitive solution for this problem but there are a few trouble shooting steps you can take to try and see what the problem is.
First, no one mentioned what web browser or version of Flash they were using; in one instance when I had this problem with Game of Thrones and a couple other TV series the problem was fixed by a Flash update; check your Flash version and make sure you have the most recent version 15.0.0.152 http://www.adobe.com/software/flash/about/
People who use one web browser exclusively frequently have better luck with a different browser, so if you're using IE then try FireFox or Chrome; if you're using FireFox then try IE or Chrome etc.
If you're using IE then go to View / Toolbars and make sure Status is checked off; when you're stuck on "buffering" what does the status say i.e. "Waiting for http://analytics.xcal.tv/player", the status should give you some idea where you're getting stuck. If you're using FireFox then install the extension Status-4-Evar which will put back the status bar that was removed several versions ago and then see if you can identify where you're getting stuck and post back.
- Norm