I have the same problem. But I discover something:
If the shortcut exist before (has been set by defaut), the modification is not taken into account after restarting. The default shortcut work's even if the key cominaison is not the default.
For example: After restarting, to maximise the window, Alt+F10 will work even if you set Ctrl+Alt+M.
If the shortcut doesn't exist by default, the shortcut works before/after restarting.
I have the same problem. But I discover something:
If the shortcut exist before (has been set by defaut), the modification is not taken into account after restarting. The default shortcut work's even if the key cominaison is not the default.
For example: After restarting, to maximise the window, Alt+F10 will work even if you set Ctrl+Alt+M.
If the shortcut doesn't exist by default, the shortcut works before/after restarting.