Vanilla has been tested extensively on Firefox 2+, Internet Explorer 7+, Opera, Safari and Chrome. Although basic functionality seems to be okay, we do not actively support Internet Explorer 6 - there's simply too many inherent bugs and trying to cover them all would result in a system full of workarounds and CSS hacks.
It looks like you're currently using undetected 0, which is rather unusual. You may be visiting from a mobile device, PDA...or are you a machine?
If you're experiencing bugs or glitches with a certain browser version, let us know and we'll get on it.