Under IE8, the tooltip property of an item (not the QTips) has a rendering bug. See the attached screenshot, taken from one of your samples. As you can see, there is a 1px transparent line at the top of the tooltip.
Thanks,
Paul
Last edited by mystix; 18 May 2009 at 3:45 AM.
Reason: moved to 2.x Bugs from 3.x Bugs