Oops, I should have been more careful and do a little more thinking and testing before reporting this bug.
I have just tried Gnome-Do under a clean user account (created for testing purposes, nothing in ~/ but defaults), and it works with no issues. Then I did some more search and found ~/.local/share/gnome-do/ containing more Gnome-Do configuration files. After removing that directory the problem disappeared.
So it actually looks like there was some config left of Intrepid version of Gnome-Do, that conflicted with a new version. My mistake was believing that removing ~/.gconf/apps/gnome-do/ is enough to clean all gnome-do configuration files.
I think this bug can be closed (if only incompatibility with old config files can't be thought as a bug itself :). Sorry for drawing your time and attention.
Oops, I should have been more careful and do a little more thinking and testing before reporting this bug.
I have just tried Gnome-Do under a clean user account (created for testing purposes, nothing in ~/ but defaults), and it works with no issues. Then I did some more search and found ~/.local/ share/gnome- do/ containing more Gnome-Do configuration files. After removing that directory the problem disappeared.
So it actually looks like there was some config left of Intrepid version of Gnome-Do, that conflicted with a new version. My mistake was believing that removing ~/.gconf/ apps/gnome- do/ is enough to clean all gnome-do configuration files.
I think this bug can be closed (if only incompatibility with old config files can't be thought as a bug itself :). Sorry for drawing your time and attention.