Titan / WP 3.2.1 / IE8 v8.0.6001.18762
When you scroll over the dropdown navigation (across the top of the theme) the child pages show, but there is a space between the bottom of the navigation bar and the top of the dropdown so when you attempt to scroll over it, it disappears before you can get to it to click on the links. (Perhaps something is wonky in the padding or margin?)
Oddly enough, it doesn't do it on all computers with IE8 (that I've seen...) I can't figure out a) what the computers have in common, and b) what is causing the issue/how to fix it.
You might see it (if you have IE8) here: http://www.LehighPresbytery.org