The template must be broken, I cannot read the tiles of the threads and sections. Moreover, I cannot read anything in the login page.
v1.0 titles show but not v2.0 on Safari 3.0.4 (MacOSX Leopard). However, everything works just fine with Camino.
Camino is Gecko based, and Gecko is much more error-tolerant. This doesn’t mean the CSS is correct.
Anyway, if you check the link, you will see that many objects have the same color of the background.
This is simply a bug, it doesn’t matter if a browser displays them differently.