Firefox 3.0.7 & WP 2.7 image alignment issue

Hi: With FF 3.0.7 I can’t seem to get images to align center, only left or right.

When I first installed WP 2.7 it was fine, then FF updated. It works fine in IE, but the odd thing is, an image saved in IE with the correct alignment still shows wrong in FF!

So I’m thinking it’s not a posting editing UI issue, but some sort of display issue. Anyone seeing this?