CSS 3 Rendering bug on Chrome v.7.0.517.41 on PC (fine on Mac, same version)

Question

Salutations all,

I'm a bit baffled. I've come across a rendering bug which only seems to occur on Chrome on a PC. It's absolutely fine in Chrome on the Mac (same version). Fine in Safari on both platforms. Fine in Firefox on both and even not so bad in IE9.

Here's the example: http://www.westore.it/testbed/cool-buttons/

I've tried using the

-webkit-background-clip: padding-box;

trick, but that hasn't helped.

Basically, on a PC, there's a background 'bleed' in Chrome. For the 'normal' and 'hover' states, the background is white and for the 'active' state, the background is grey. Very annoying.

Absolutely any suggestions are very much welcomed as, quite frankly, it's doing my head in!

Thanks in advance.