Yes, ugen0 seems to come and go. I wonder if it is dropping into some power-save mode. I wouldn't put that past canon.
Maybe those "cat test > " commands we were trying to use to see if permissions were OK were disabling the device - also possible.
Nevermind. Remember, from now on: always check that /dev/ugen0 exists before testing.
Could you try sane-find-scanner and scanimage from the command line as the ordinary user again? It might work now.
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