Twenty ten drop down menu sticks open in IE

I am at draft stage on a customer website and noticed the Twenty Ten drop down menu sticks open in IE. When you mouseover the menu, if you move the mouse away without clicking on a link in the drop down, the background of the drop down (no text) sticks open on the page. The only thing that will retract it is to mouseover another area of the menu. – This does not happen in FireFox, only IE.

It just dawned on me to test this on the Twenty Ten dev site – http://2010dev.wordpress.com/ and that one does not have this problem, the drop down closes no matter which direction you move the mouse away from it.

So now I’m thinking it is being caused either by my server environment (GoDaddy shared hosting) or one of the settings I’ve changed in the theme.

I’ve searched all over the net and these forums and can not find an answer to fix this problem. – For the life of me, I can not spot the problem in either the CSS or the functions. – I have heavily modified the theme and can’t help but think I’ve caused this to happen.

Please take a look at it and let me know what I need to do to correct this problem in IE. The draft site is here — http://www.demowebz.com/dwwp/.

Thank you!