I have the same problem with random websites with tennis.com being notable, as I access it a lot.
The loading of the websites usually gets to a point where the status bar tells , "Connecting to ...." or "Waiting for ...".
This problem is only with my ubuntu installation. The websites load fine when I attempt to access them from windows.
Could you help me troubleshoot this. This has been particularly bothersome for me as I am taking a MOOC from coursera.