Strange forum appearance

[RhinoBull]

I have never seen this before so here is a screenshot and the source.
I'm using IE6 and XP - please don't suggest to use another browser.

[brad jones]

Looks like a broken tag. Is this error repeatable, or did it only happen once?

[JPnyc]

Probably a coding error in an advert. If they don't close a tag or improperly nest them, it affects all those which come after.

[Hack]

I have seen that before, but not on any consistent basis, and it has never lasted long.

[RhinoBull]

... Is this error repeatable, or did it only happen once?
Error wasn't exactly repetable but surprisingly screen did reappear after navigating elsewhere and then pressing Backspace (or the Back button on the browser).

[Hack]

You were just in the right place (or wrong place, depending on your point of view) at the right time, but thanks for pointing that out.

Perhaps the actual culprit can be traced down.