Just a follow up to this problem.
This problem was really being caused by the software we were using for load balancing. We replaced haproxy with Pound and now our forums are working just fine with IE as well...
Since with IE it is a little bit slowen than with FF, we decided to order a hardware-based load balancer. I believe this will solve all our problems and also make our forums faster.
Cheers,
Gabriel.
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