Hi,
I found out that on the 2 pc's on which I got the error the value in the registry for the default printer is wrong.
HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\Windows
"Device"="\\\\networkshare,winspool,Ne15:"
Here there should be the networkshare comma the spooler comma the network port of local port.
With the problem pc's the port is wrong.
You can see witch port should be used under
HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\devices
Could you check on your problem pc if this is also the case?
When you delete this value and than set the default printer again, the value is recreated correctly.
I haven’t found out why this value gets corrupted.