CSS drop down issue in IE 10

CSS drop down issue in IE 10

I have a CSS based 2 level drop down menu which works just fine in
FireFox, Chrome, and IE (before 10). In IE 10, the drop downs don't work.
I have tried both standard and quirks mode, and it just flat does not work
in IE 10. I have taken apart the menu and I just can't figure out what is
missing here.
The site is live at http://www.cmftexas.org and the menu in question is
the top grey/black bar on each page.
Any ideas or suggestions would be greatly appreciated!
TIA, -- Jeff