It isn't really the answer to your question but maybe you can take a notice... [Frown]

I did a printserver migration and used a script ( See Topic) to change the servername at the clients

First the script removes the printers connected with the old server and after that it reconnect the same printers on the new server. The default printer didn't change by reconnection.

Try to add: [HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\Windows]
"Device"="\\\\printserver\\printername,winspool,Ne3:" (the one you want to be default printer)

If it doesn't work with user credentials try if it works with admin credentials. Maybe that is the problem... [Roll Eyes] [Roll Eyes]