Have you checked that your IE security settings don't prevent you from loading content outside (powerbi) from current web site? I had similiar problems and after adding two external sites to IE's trusted websites the problem was solved.
You can see the needed websites to be added to Trusted websites from source of the problem page. I think there was 2 sites (something like download.microsoft.com and *powerbi* something). There was no problem with Chrome or Firefox.