Thanks, that actually brought me on the right track: I had changed 
SANE_CONFIG_DIR in /etc/init.d/scanbd (which still ships with the 
Debian/Raspbian package) but not in /lib/systemd/system/scanbd.service. Why it 
ever worked at all with the wrong/no SANE_CONFIG_DIR is beyond me.

Problem existed before the screen and is solved now, thanks again for your help!

Am 09.04.2017 um 13:22 schrieb Wilhelm Meier:
> Please check the SANE_CONFIG_DIR env-variable for your foreground runs.

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