I think UDF sometimes should be redefined as ""User Dumb..."" The bottom line was that I tried to link the wrong source UDF to a UDF in the GL Daily Posting file. The UDF I was looking for did not exist in the source I was clicking on. The wierd thing is that just before the error 65 displayed, the list displayed the non-existent UDF!
I followed my trail back to the source, found the correct UDF's, now all is well in LaLa Land again :)