We've noticed on a CMS 7.5 site that when editing with IE9, the autosave feature isn't triggered when changing font colour in TinyMCE.
Pick a block with a TinyMCE property
Click on the All Properties button
Select some text
Change the text colour with the Select Text Colour button
Autosave will not fire.
Go into the text, press the spacebar and then delete
Autosave will then fire.
Is this a known bug?
Yes its a "fixed" bug that still haven´t been properly fixed http://world.episerver.com/support/Bug-list-beta/bug/116624