Wirelessly posted (8820)
Do you have a blackberry data plan? Not just your service providers mobile data, but blackberry data service.
If so, open the blackberry browser, open menu, click options, browser configuration, and then check all the settings with a checkbox, and then try http://m.youtube.com/
Also make sure you are using the appropriate default browser, hotspot versus internet, depending on whether you are connecting via wifi or mobile network.