The rich text editor eats newlines in-between the horizontal rule tag and centered images.

To reproduce:

Create a new page and attach an image. Then edit the page in "WIKI Markup" mode and enter the following markup

Save the page. Edit it again, this time in "Rich Mode". Save the page without changing it.

If you edit the page again, you'll find that the markup is now

----

which causes the horizontal rule to render incorrectly. If you rich-text edit it again you end up with

----

Curiously, if you remove the 'align=center' from the image link the problem doesn't occur.

PS: Please consider this my entry for the 'least urgent issue of the month' award