I'm seeing similar issues. Nothing is working within the editor box. Text size can't be changed, linked, etc. Opening the link box, sometimes it is behind the editor box, sometimes in front, but I can't close it or use it. If I type in the link and hit a hard return, the link does work but the cancel or ok buttons don't work.
I've uninstalled and reinstalled, dumped the .dat file.
The only item that preceded the upgrade to h3 was updating security assist. I have not yet installed the new extender.
This is in Safari and Firefox, not IE9.
Any thoughts, most appreciated. Perhaps a sequence of installing Security assist, then html 3?