It happened even in the old system. Seems to be when someone quotes a quote from a previous post, but doesn't get the entire thing. So the end up with a [ quote ] box with an opening html div tag inside it, which then screws up the layout heirarchy completely. A simple edit and switch to html mode and back will add closing div tags, though I generally clean it up and remove the divs entirely when I see it happen.
Im testing too, because I screwed up my empire thread before. Thanks for getting it fixed by the way.

I'm kinda skittish about it now...
Testing again....
Seems to be working allright. Before the forum upgrade I would occassionally have problems, but I could always go back and edit to fix them. With the problem I had a couple days ago, my browser couldnt display the page after I had made the mistake, so I had no opportunity to edit it to be correct.
Sentient species taste better...