But it does not look checked, right? One should be checked. Also, clicking it has no (visual) effect (though it will toggle the checked attribute in the DOM). It’s a truly terrible bug, and a strong argument that Opera should not use -webkit- properties like transform until it can actually handle them.
I reported it a couple months ago and have not received any follow-up at all.
It is checked and checking it works as well (11.64 at home now). But as other comment pointed out, it looks ugly. I tried FF 9 - same as Opera - works and is ugly. In Chrome 19 it does not work at all (i.e. the checkbox is small).
So it got fixed. And I don't think they do follow-up unless they need you to reproduce the bug or something.