Re: Using CSS3 Pie with jQuery BlockUI
I'm not sure it's actually a z-index issue, position:fixed should handle z-index fine. Problem is, there's another bug where it doesn't position the element correctly if its target is position:fixed. There's a ticket for it: http://github.com/lojjic/PIE/issues/#issue/74
-- see the forum post linked to in that ticket, it has a patch which seems to fix it in a subset of cases. It might help you get around yours.