I appreciate the input on Gosub. I actually originally had the script set as you do, to map the drives directly in each section, and was still seeing the problems with some workstations not getting their mapped drives (couldn't tell if they were running the script or not). I switched to this one to see if a change to the mapping procedure made any difference (and it had the error logging built in). I now get error log files from some machines, but not others. I was a little curious about your comment regarding spaghetti code. What is the difference between a Gosub and a function() call? Aren't they essentially the same as far as the flow of the code in the script?

I forgot to mention in the original post: the desktop environment is all XP Pro (some sp1, mostly sp2), and the backend is all 2003 server. AD is running in native 2003 mode, and replication is working fine between all 3 domain controllers.