I think this might be a Microsoft issue.
OK now you just simply cannot use the align, colour, font and other styling options when editing your signature in IE v6+.
I did try to align my text center but when I clicked on "Preview Signature" none of then align or styling options are saved and reverts back to the signature before you started editing.
Now here is the fustrating part:
Clicking on "Preview Signature" randomly crashes my browser (this is on all the workstations in the office) if using Microsoft Internet Explorer v6+
Microsoft Windows Seven Enterprise
Internet Connection Type:
Microsoft Internet Explorer v9
Same Error on diffrent vB forums: