Uploading drivers to my broker used to work, but now I get an error

Internal Error
A page has performed an illegal action

This appears after the file copy has taken place, and just *after* the
message "The driver is uploading to the broker. Depending on driver size,
this may take up to 2 minutes. Please wait..." appears.

I'm using iManager 2.6 with iPrint plug-in

When I try with the iManager on the server (NW6.5 SP4, iManager 2.0.2) I get
a pop-up error saying "iPrint Client - The request requires user

Any ideas, anyone???



PS The driver in question is the PostScript driver for an HP LaserJet P2015,
but the problem seems to exist with any driver.