after updating to KDE 5.14.3 I am no longer able to use EPSON iscan with my EPSON V550 scanner. (msg: "could not send command to scanner").
It does work with Linux Mint 18 Cinnamon, so I assume that it is somehow related to the KDE update.
Grateful for any suggestions.

I had a similiar problem (also use an epson scanner) and ended up d/l the driver from:

http://support.epson.net/linux/en/image ... .21#ubuntu