Videos won't load on TeamFourStar.com

[MDawg957]

http://teamfourstar.com/video/dragonball-z-abridged-episode-52-flashpoint/

An error message comes up on videos unless the rule Longtail (partial) is disabled.

[dddux]

Just to say that I also noticed a fortnight ago that some videos just stopped working on some websites like Vodlocker, for example. It took me a while to find out which add-on is causing this and I was quite surprised to find that HTTPS Everywhere is the problem. So I had to disable it until the issue is solved. I'm using Iceweasel with Debian 7.9.