[chrisinmd]

This may or may not be way off, but I remember reading somewhere that the C18 compiler has trouble with filenames longer than 64 characters. It wouldn't compile some code that I had in the My Documents folder once, so I put all the code in a folder in the root c: directory. Worked fine after that.
Just something I remember, may or may not help you!
Hope you get it figured out.
Best of luck,
-Chris