I had a similar problem as you do. I could not go past the Terms and Agreement screen.
I filled up the support request form and got the reply within 24 hours, pretty fast.
Here is the reply below. I cleared the cache and cookies. Waited overnight. The next morning, the problem was solved. Hope this helps.
I understand that you are unable to pass the agreement phase when trying to submit your course in iTunes U.
There are a number of troubleshooting steps that may help you diagnose what could be causing this issue. First, make sure you are using Safari as Browser. Then I suggest that you clear your cache and cookies by reseting your Safari browser.
If the issue persists, you might consider try from a different network outside your School or Business.
After you have completed the steps above and still unable to successfully submit your course, please reply back to this email with detailed screenshots so that I can further investigate the issue.
I hope you have found this information helpful. Feel free to reply back to this email if you require any further assistance and I will be happy to help.
I am looking forward to hear back from you.