Well it looks like Microsoft is finally supporting IE9 for use with FPSMC under Hotfix 1 (released 6/5/2012). Outside of the aforementioned IE9 support, there a few other bug fixes with this update but otherwise it is pretty quiet.
The new update can be downloaded at:
This update will remove the existing installation prior to installation and can install over the top of the existing SQL database, no reboot is required.