Have redhat 6.2 Pro server with secureweb clean everything install, no raid. After exhausting all bug fixes and updates etc, I finally read the syslog in /tmp on a rescue install, found USB error etc. Have 2 usb devices attached, HP Scanner and Jumpshot compact flash reader , removed Jumpshot device install script loaded fine.
Thanks for the information - it is currently only necessary to have a mouse and/or keyboard attached during an install. USB support is still preliminary for other devices.