Youtube doesn't work after Mountain Lion installation

I recently installed Mountain Lion on my iMac. Since then the Youtube website will not open when on wifi. 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.

CD/DVD Drive - Troubleshooting
CD/DVD Drive - Troubleshooting (2)

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