CUPS 1.2.1 error - printer not connected

[Chris Lale <chrislale@untrammelled.co.uk>]

I have a fresh install of Etch (Testing) with CUPS 1.2.1-2 using local 
parallel port lp0. I can install a printer (HP Laserjet 4 driver), print 
a test page and print from applications. If I reboot and print anything, 
CUPS begins processing and then displays the error "Printer not 
connected; will retry in 30 seconds..."

Deleting and reinstalling the printer works until the next reboot.

These packages are installed: cupsys, cupsys-bsd, cupsys-client, 
libcupsimage2, libcupsys2, libcupsys2-gnutls10.

There is no obvious clue in the cups error log.

Is there anything else I can check before considering this as a bug? 
Suggestions gratefully received.

Chris.