Problems collaborating on Rise course

Hi, I'm new to Rise and doing a demo version, just to get familiar with Rise. I have invited a team member to collaborate on the course. When she clicks the link in the email she is forwarded to the course, everything looks fine, but after having clicked Take control nothing happens. She is left on an empty page, showing only the top bar with pages open on IE.

Anyone who knows what might cause this/what we need to do?

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