I don't know if it's a bug in ScoobyNet or in my browser, but the underline on posters' usernames does not appear to render properly using FireFox. (it looks fine using IE 6.0 on the same machine)

The line appears in black for all users, about level with the top of non-ascending letters in the user's title.

I think the positional problem lies with the "bigusername" style which is assigned to the user link, but which is then overridden by a "font" directive for the actual text of the username. Hence, the text has a size of "2", but the link has a font size of "14pt".

I guess the colour is wrong because (again) this is only applied to the text part of the link, and not to the whole link.