I think I've found the culprit. I had to turn off Malwarebytes 'web protection' feature. I now have no problems resolving FQDNs using the ping command and everything internet and server-related is now 'green' in the app. The Nslookup command worked just fine and had me wondering what was wrong. I should have tried Malwarebytes earlier, just didn't want to give up on that feature. I'd be happy to send my logs, but not sure if they'd be useful (or where located?).
In any event, thanks much for your assistance with this matter.