Tin Can "unable to connect to server" error

I recently added Tin Can support to my company's LMS. Now we can launch Storyline presentations in Firefox, Chrome, and Safari on a PC, Safari and Firefox on a Mac, and Safari on an iPad. The LMS receives exams scores perfectly. We are no longer dependent upon Flash, which is great considering the popularity of the iPad.

Now the problem: I consistently get an "Unable to connect to server" error when trying to launch using Tin Can under Internet Explorer. The presentation launches and runs -- which means it did connect to the server -- but I cannot interact with it because of all  the errors in popup windows.

What does IE need that all the other browsers do not?

Thanks!

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