I had the same problem with a permission denied for the backend, after I
upgraded my cups
to version 1.4.3-1
After some searching on the Internet I found debian bug number #585153,
which describes more or less the same
problem.
The solution for that problem (chmod go+rx /usr/lib/cups/backend) also
fixed my problem. I'm almost sure it will also
fix your problem.
See the bug #585153 for more details.
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