Mac apps not seeing iTunes library

Mac apps not seeing iTunes library

I've got an iTunes library of about 6000 songs plus a couple of dozen videos. For some reason, only Front Row and iTunes can see it. When I try to access the library from other applications, such as iMovie, iWeb, or any thing else, I am told that I don't have an iTunes library! Is there anyway to fix this? I am running Mac OS X 10.5.8 Leopard on an Intel Core 2 Duo iMac from 2006. In fact, I've been having this problem since Mac OS X 10.4.