I added a line so IE8 would go into compatibility mode.
What happens when you turn compatibility mode off on IE?
Looks like I may need to come up with another idea.
Edit: Were you able to see the RSVP list in the social forum prior to yesterday?
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I reverted back.
Looks like my line fixes one thing and breaks another.
So the solution for now at least is to run IE8 in compatibility mode.