Running 37.0 Firefox on Windows 7 - 64 bit. All updates updated. Flash is 17,0,0,134 and checks out at Adobe site. This afternoon YouTube videos stopped playing. In the center of the frame are circling dots. The video appears to have loaded, as I can move the time slider and see frames at the various times, I just does not play, just gives the circling "loading" dots. YouTube runs fine in IE. In Foxfire, if I go to other sites, like news and videos/ads play just fine. I disabled all add-ons, set Shockwave & Flash to "always activate" and still the YouTube videos will not play. Seem to download, just not play. Thanks in advance for any help.