WPMU Forum Bug: Links in post cleared on edit

Ok here's the detail.

1. Attach an image to a new post
2. Create links
3. Submit/Publish
3. Edit the post, moving the image bracket to the right place between paragraphs (something I do all the time after publication, rather than having them sit in the footer out of context).
4. Update/Publish
5. All hyperlinks href tags are cleared