I have searched many threads on this forum and also on the web in general. I have Yosemite 10.10.5 installed on my Mac Mini (Server edition Mid 2011). all of a sudden when access the network preferences, it just hangs. I can access all the other configs in System Preferences apart from Network. Has anyone else had this issue? It’s annoying as it also affects my MBP which I don’t use much now as I no longer work away from home. Network connectivity is fine, just can’t make any changes to my network. Would upgrading to El Capitan solve it? Or would I be better installing the Yosemite ‘server’ app? Any help would be gratefully appreciated.