Description of problem:
Scanner is Epson Perfection 2480 Photo (USB).
Worked great with sane-backends-1.0.18-5.fc6 and sane-backends-libs-1.0.18-5.fc6.
After upgrade to sane-backends-1.0.18-15.fc6 and
sane-backends-libs-1.0.18-15.fc6 xsane gives an error: can't find any scanner
Must be some bad bits in the upgrade...
What does "lsusb" give?
After a reboot, xsane works with sane-backends-1.0.18-15.fc6, case closed.