Got it fixed - I was neglecting to copy the Plan G files folder from My Documents.
Had some networking issues, incorrect IP in the simconnect.xml and also Windows Firewall was blocking the port.
Working great now...Thanks for this software!!

Plan G works fine on my FSX PC. I've tried copying the Plan G folder over to the networked PC, still can't access menus. Tried both 3.1.3 and 3.1.4. Tried database exporting from FSX PC and importing to networked PC.
Tried updating to latest .NET, PC says it's already up to date. Windows 10. Any ideas?