I'm having a similar issue but I want systemctl to handle the services.  It worked perfectly for at least 2 months but after a reboot last night mmdvm_bridge won't run.  When run from the console it complains about not finding DVSwitch.ini.  When I run it from the console and specify where that .ini is I get a "cannot read the .ini file"

After hours with no progress I guess I need a life line.