Last Winter while i was working with OpenCV and saw a new error.
GLib-GIO-Message: Using the 'memory' GSettings backend. Your settings will not be saved or shared with other applications.
after researching a bit and found that same error occurred while working with Numpy and Matplotlib.
why GSettings changed without any reason !!?? then realized i installed Anaconda for research purpose and Anaconda.sh overwrite default gsettings in linux.
So the easiest solution is :
rename gsettings as gsettings_x .
we know, anaconda default installation directory is