Some things changed under the hood which resulted in a bug.
See this:
and this:
and the "won't fix" answer of the author.
so you have to edit a configfile manually:
sudo pluma /usr/share/glib-2.0/schemas/30_ubuntu-mate.gschema.override
and change the background= entry
then recompile the schemas:
sudo glib-compile-schemas /usr/share/glib-2.0/schemas/.
This seems to be the accepted workaround for the time being.
It lacks a bit in elegance I'm afraid. But it works pretty well.
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