Waited for a couple mins then moved forward toward
You probably had to simply wait a bit more.
Stopped again and reset the follow me service, still nothing
That's normal, Reset will just kill the follow me but then you have to aks for it again.
One thing I noticed though was the ngx doors menu wouldn't allow me to open any doors, the jetway wouldn't move either. The ngx was shut down with parking brake st.
That's not a GSX problem either, which doesn't touch anything in the airplane config. GSX only READS the airplane status, it doesn't affect it in any way.
Since it was the PMDG doors menu that didn't allow you to open doors, that's a PMDG usage issue that would happen exactly the same even without GSX installed. You probably shut off the airplane and then, without connecting an alternate power source and enable it on the bus, didn't had power to operate doors, which is realistic.