My iMac won't connect to Youtube via wifi. Ethernet is ok.
For reasons I cannot discover, I cannot open Youtube.com via wifi on my iMac. It will open when ethernet is connected. This is the only site that seems to be affected. It stalls for a second or two, then I get a blank screen and the URL changes to www.youtube.com/?tab=w1. I read through every forum I can find, tinkered with the network settings, deleted cache files for the browsers, etc. Firefox, Safari and Chrome all do the same thing. It was working fine for awhile and I don't believe that we changed anything that caused this, so I am at a loss. Has anyone else had this issue and know how to solve it?
iMac, OS X Mountain Lion (10.8.1)