So, I just posted in one of the forum games, the one with "MY COOKIE"
I only used formatting for one of 3 lines. I am more than sure that the other 2 lines did not have underline, because i edited them as such. Still, I see underline. Dunno if you see it too.
I see even the title of my post underlined. Even the "X minutes ago" thing is underlined, but only for that one of my posts.
I have Windows XP SP2 (shoo, haters) and I use latest version of Mozilla Firefox.
EDIT: I suddenly see even the "Who is online" and the list of online members underlined now.
proof : http://snag.gy/yUUlY.jpg