scable

My Epson scanner -- perfection 640U -- was working just fine with RH7.1. Now I have installed RH9 and neither the Gimp nor Sane can fnd the scanner. I have double-checked everything I know to check -- the /etc/modules.conf file, the /etc/sane.d/epson.conf file, the link to /dev/usb/scanner0, the permissions on scanner0. As far as Ic an tell, everything is in order. Can anyone think of anything I am missing? Is there something new about RH9 that I should know about? Thanks.