There is a undocumented attempt with version 7.5.6 to fix the issue with IE. At least it is not in the change log. But there are some topics on it where a attempt to add a meta tag to the pages helped for some users.
In the current version here I see that tag has changed a bit also.
Just view the source code for this page and in the head section you will see it.
Although in this version it has changed to IE=Edge
do a search here for EmulateIE7 for more details on the subject.
