Steve Kichen wrote:
The problem is that the submenus do not show up under any of the other tabs -- EDUCATION, ABOUT, DONATE, etc. At least they don't for me no matter which browser.
I've taken a look. Wow.. Menus everywhere 
It did take a little effort to work out the setup and how it's been put together. Once I got passed that, we were on the way.
I've taken a look ealier this morning.
I was expecting to see missing assignments to other modules / menu items which would have explained it not showing up. What I looked at and saved should not of done anything but it appears your menu structure is now working...
I honestly don't think I have done anything to correct this. Have you been working on it??
Just a few recommendations on the menu.
1. About Us, Donate and other items at that level, on the Top Menu, I would change each item from a Seperator to an Alias and direct say the About Us top menu item to the other menu you have with the list menu item / article (Refer to the image).
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2. Since you have the dropdown menus, do the horizonal menu actually add value to the Website? The reason I ask is: If the horizonal menu below the RokNavMenu was different to the dropdowns, I would say yes... but since they duplicate the dropdown menu, it seems a bit excessive. Are you intending to remove the dropdown menu items and stay with the additional horizonal menu?
3. I would take a look at the latest RokNavMenu and the options it has (your installed version is 1.15, the latest is 2.9). Also have a look at these demo's on the latest template as I'm guessing this is what you are trying to replicate.
demo.rockettheme.com/?template=tachyon
or
demo.rockettheme.com/?template=paradox
If there are still issues, let me know and I can take another look.
I've tested this in IE 8, Firefox 3.6 & Chrome 9 and the menu is working