Hi Julian,
As for the "No USB driver found" message, I started getting that same message after connecting my new Epson printer (even though the USB driver is installed and the printer works fine). At that time, I was using OS 9.0.4. After upgrading to OS 9.1, I still get the same message.
You can stop the annoying message by tuning off the "Software Update" control panel in your Extension Manager control panel.
Art D