Hi,    I had recently installed the latest NAM, I have SC4/Deluxe/Rush Hr/, but when I access the "Build Highways and Ramps" menu, the section under Custom Interchanges is empty. I just get the small white box and a buzz when I try to click. Nothing happens.       Anyone have an idea of what to do? Can I try a reinstall, when I originally installed it, I just chose the default, not the custom. Does that leave it out by default?    Appreciate any help with this!