I'm running both Enterprise 2009 and 2010 (on different servers). When maps are loaded in Internet Explorer 9 or 10 (32 bit versions, but also 64 bit versions) the toolbar tools do not work. Things like zoom, pan, select. The mouse wheel still zooms the map. I'm trying to find an answer if these browsers are simply not supported by these older versions of MGE, or if there is a fix for this. Thanks.
You could try this patch from the Open Source community..