I have been trying to figure out the rights issues in Linux (F9). Using the chmod 666 command makes it work for the ports but by default when unplugging and replugging the USB converters the rights go back to 660. So it would seem that we need to be a member of the 'uucp' group (which is the group default on CX for the usb ports) to fix it. I will report on what happens. Then we should be able to just unplug and replug without losing the com port connections.
-Alan