The application don't realize the right actions when use "Hangouts IM" in IE

REPRODUCIBILITY LEVEL:
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Always

STEPS:
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Steps
1. Open the link https://intranet.rivetlogic.com
2. Login with the right credentials
3. Expand the control panel from the left
4. Click on "My Dashboard"
5. Click on "Hangouts IM"
6. Add an user
7. Click on "Start a Hangout"


Video Chrome (Works fine)
https://www.screencast.com/t/Qg1pIE2sbq09

Video IE
https://www.screencast.com/t/WBLTGIksej5R

CURRENT RESULT:
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The application don't realize the right actions (Don't display the Join button)

EXPECTED RESULT:
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The application display the join button