are they supposed to have thinnish lines between the buttons?
Yes they do - but they used to have bright borders around them in their first version which were not supposed to be there.
And I didn't exactly put in any "hacks" for IE - but I did take into consideration that IE needs some things declared repeatedly because no version of it will "inherit" things properly like standard complaint browsers do.
This only means that things need to be delared every time you use them instead it simply inheriting the right properties from their parent declaration.
Repeating things will not make other browser treat stuff differently though
And what's that css bug you're talking about?
The site itself hasn't been using any css when it first opened....
I've only converted it to using css lately, so what exactly IS the issue here?
The forum has a css that was written by the theme developer of course but I'm not aware of any obvious "bugs", so please post some more information about what exactly you think is a bug here?