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Collaborate ultra not working...

When i try to go to my online tutuorial classes on collaborate ultra they don't load... For all four of my classes the collaborate ultra page keeps loading and doesn't show any of my classes. I have tried restarting my computer, logging in and out, clearing my cache and history and restarting Chrome, but so far nothing has worked. It hasn't worked since Tuesday and I thought I'd wait a few days to see if it sorted itself out but it is still not working. I know it isn't an issue with internet connection