epson usb scanner - device busy

[Carrot Cruncher]

hi. just tried to use the scanner in my epson rx425 mfp for the first 
time since upgrading (actually a brand new install) to fc9.

sane-find-scanner returns the following entries when run as root :

found USB scanner (vendor=0x0557, product=0x2008) at libusb:001:004
found USB scanner (vendor=0x04b8 [EPSON], product=0x080f [USB MFP]) at 
libusb:003:004

but scanimage -L returns no scanners. if i run scanimage with debugging 
enabled i get the following :

USB error: could not set config 1: Device or resource busy
[sanei_usb] sanei_usb_open: libusb complained: could not set config 1: 
Device or resource busy
[sanei_usb] Maybe the kernel scanner driver or usblp claims the 
interface? Ignoring this error...

but i don't know what this means. can anyone help me ?

oh, and this exact same setup worked fine in fc8.