You might try an update to 1.0.22, which is in the Fedora 14 "updates" repository. Either use "yum update" for a general update of your Fedora system, or "yum update sane-backends" to update just that.
Alternatively (if your machine has no Internet access) retrieve just the sane-backends package from: http://download.fedoraproject.org/pub/fedora/linux/updates/14/i386/sane-backends-1.0.22-3.fc14.i686.rpm and copy it for local installation on the subject system. I expect the SANE maintainers would prefer to diagnose a problem on the latest version, instead of 1.0.21.
