Pop-up in Mendix 3.1.1

When I login into an acceptance system a pop-up is triggered to let you know you are in the acceptance system. picture with example When you press on the pop-up the screen greys-out, but the pop-up remains visible. The result is that you cannot do anything. picture with example There are no problems with Firefox. I am using IE8 Edit: I am also experiences other differences between IE8 and Firefox with retrieving and presenting data in a view etc. But always: Firefox works fine and IE8 not
1 answers

This is a nasty bug that was introduced in 3.1.0 as far as I can tell. It will be fixed in the next release. There might be a workaround but you'd have to file a ticket for that unfortunately :(