alt131 - 3:47 pm on Jun 7, 2011 (gmt 0)
... but unfortunately I can't see a difference. Having once failed to see a 3px gap for almost an entire thread, this should not be treated as final until confirmed by my seeing-eye dog :) Also tweaked display settings. Do the variations suggest machine rather than browser perhaps?
I need to sign out, but have you run the samples through Op11 winsafari5, ff4 and observed the results of different values for background-clip? Further fun in setting border-style:double, inset/outset illuminating, as is commenting out border-color background-color and colour. I had a vague notion some border-drawing issues had been corrected, so definitely back to investigate further tomorrow.