Yesterday we upgraded to 2.3.3 build 20121112. Today we found that nobody can upload a file when using IE9. When we try to upload a file, in the "Content" box it just shows a spinning wheel.
In testing with IE10 and Firefox this same wheel show for a very short time prior to displayin the dragable upload box, but with IE9 we are left with no option to drag a file or select a file.
Server and Client details
Server Win 2008 R2, IIS, MySQL fully patched
Client Win 7 x64 and x86, IE9 fully patched and tested with multiple AV programs.