Ran into an odd scenario in our Citrix environment where we received a popup complaining about renaming a file on the root of C called 'Program'. I noticed I was missing my mapped drives (mapped with policy Map Drive actions - Not WSG or logon scripts) on servers with this file. EM logging shows the drive map action passed. Deleting the file fixed the issue. It is repeatable by simply adding a blank Program file to the root of C.
I don't have much more information but thought it was interesting enough to post.