[sirinsidiator]

I added this code which seems to solve the problem. Not really happy with it, but at least it seems to work now.

SaveSettings() -- save and restore the settings when we leave an area through a loading screen, otherwise they may get messed up
    RegisterForEvent(EVENT_PLAYER_ACTIVATED, function()
        if(not GetGuiHidden(INGAME_GUI_NAME)) then
            ApplyCustomSettings(savedSettings)
        else
            ApplyCustomSettings(DESIRED_SETTINGS)
        end
    end)
    RegisterForEvent(EVENT_PLAYER_DEACTIVATED, function()
        if(not GetGuiHidden(INGAME_GUI_NAME)) then
            SaveSettings()
        end
    end)