Comment 2 for bug 1492179

Hey dor, thanks for the report.

Please confirm that this has not been fixed by our daily PPA (not the old software center version).

First, completely remove wallch from your system, and remove the configuration files, aka the folders
~/.wallch and ~/.config/wallch:

sudo apt-get remove wallch

rm ~/.wallch/ ~/.config/wallch

Then, install the daily PPA in your system and then Wallch from there:

sudo add-apt-repository ppa:wallch/wallch-daily
sudo apt-get update && sudo apt-get install wallch