Oh sorry for the delay on a response here, I figured I must have done something off in configuring this server.
So i rebuilt it, New install on a different USB drive and it has happened again. Exact same symptoms.
To answer the questions above, the mistake i might have made is clarifying the Gui that isn't loading is the management interface via Browser (in this case http://192.168.1.196/main)- to access the Menu, Docker, Tools etc.
-I am able to SSH in, (though my linux is very weak, and one reason i like unraid, is the webgui ;( )
-I am able to ping the server inside out, DNS is working internally and externally however i am only using IP's atm,
-I am also able to use the Unraid - OS Gui mode Firefox to access the internet and say post my issue here.
The strange thing is this happened just after a reboot of several days of the server ONLY running Plex and the array not being in production / streaming. I was building the library's and pulling metadata down. No VM's, No Dockers (other than Plex), No special settings running 6.6.6.0 RC.
Reboot from the Plex docker seeming to lock up ? Become unresponsive, and the GUI is gone.
Any help?