Multiple editing errors with IE 9 in WYSIWYG Heading editing

Using IE 9.
1. Create a new page WYSIWYG modee
2. Create a Heading of style Title 1.
3. Place cursor at start of Heading, hit enter, set both to Title1.
4. Place cursor at end of Top Heading. Hit enter. Instead of new line hop to start of lower Heading.

Keep hitting return. Nothing happens in WYSIWYG view. Switch to Source, see many blank lines. Save & View and see them in WYSIWYG as well.

I saw more than one other defect, but these were so easy to see I didn't bother continuing to uncover them.

UPDATE:

we don't see this bug on Chrome. On IE 8 it's not as severe. The first 1-2 returns are missed, but then the WYSIWYG view starts to show returns. It's still out of sync however with the Source view.

Is there an environment you host I could test in? These WYSIWYG editing bugs are sure hurting us and we'd like to help you with them. Contact john.faughnan@mckesson.com if we can help you.