I have a strange one...
I use client 4.20 and have MS Office 2003 installed.
When I try to select an iprint printer it won't do it. I get an error
saying cannot find printer. If I select a local or any other network
printer it works.
If I quit Powerpoint, set an iprint printer as default, this printer
will work. I still won't be able to change to a different printer.
All other Office 2003 applications work fine.