I also tested this on Ubuntu Hardy and the behavior is identical: as
root both HP-Toolbox and xsane work properly, but when launched as
regular user they have communication problems with the devices:

xsane doesn't even detect the scanner
hp-toolbox does not communicate with the printer at all

This confirms my suspicion that this is an ownership/permission problem,
or at least it looks like it is one. After all, why does it work with
root permissions?

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xscan not connecting with scanner and crashing
https://bugs.launchpad.net/bugs/109727
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