Odd issue I have come across... I have a function that I defined myself and the .pro file is located in a directory which is included in my !PATH, however when I run a program that calls this function it doesn't find it and compile it (keeps thinking it is an undefined variable). However when I compile this function before running my main program all works as it should. I really don't think it is a IDL !PATH issue, because I have another function that I call within this main program which is located in this same directory and it compiles automatically. Anyone know of other possible reasons IDL wouldn't be able to see this file? I have checked other directories in my !PATH however I don't see any duplicate function names (I even renamed the file just to be sure). Any help would be appreciated, thanks! -Steve