Thanks for all the replies! I forgot to mention, or didn't say very well, in my original question, that the scripts are working for 80-90% of my population! These scripts have been in place for years, and nothing with the scripts has changed for quite a while.

Having said that, the fact that it appears the drive is mapping but not showing up makes me think that maybe it is something with the user logging in? I'm just not sure why some work and some don't?