Not sure if this is related...
I often copy/paste the double-arrows from Control Panel into posts, like this:
Control Panel » Forum Settings
When I Preview post, it NOW looks like this (here):
Control Panel » Forum Settings
Altho it displays fine when I actually post it.
And interestingly, when I Preview the second one, with the  in it, it displays this even more crazy in
Control Panel » Forum Settings
(Click Quote and then Preview to see what I mean)
My 7.0 board is fine.