Yep I can see that the fix is in place.
And I can see the issue with IE8 but not firefox.
But I also noticed that the styles in question are really designed for versions prior or equal to ubb7.4.2 And you are using v7.5.1.
Even though Rick posted sunny style at ubbskins.
Zarzal is really up to date with this stuff maybe he can give us some input.
