I have such problem.
When I wish to change some settings in [System Settings] >> [Display and Monitor] >> [Compositor] >> [Rendering backend]
^^ after changing from XReneder into any OpenGL and clicking [Apply] looks like changes are OK, but after closing [System Setting] and opening them again I have XRender again instead of OpenGL
Any others changing works OK, only [Rendering backend] looks like doesn't work.
