Readiris not seeing plug-ins/Twain

[christopher94523]

system: iMac G5 with 2GB RAM
operating system: MacOSX v10.4.2
scanner: Epson Perfection 1250
Epson driver: v2.65A

Installed scanner software
Rebooted
Ran a scan - fine
Installed Readiris Pro v9.0r12
Rebooted
Aliased Applications>Adobe Photoshop CS2>Import/Export>Twain.plugin
--Put one in Library>Application Support
--Put one in Library>Application Support>Epson Scanner Module
--Put one in Applications>Readiris 9
Started Readiris
Readiris>Preferences>Scanner drop-down list only shows "File"
It's supposed to show Twain

As Zippy would say: "YOW!"
What gives?!

thanks,
chris <rasputin@teleport.com>