I know the MDL Lite app doesn't need any configuration so it automatic.
Can you see the DNS if you open a web page to mydlink.com in a web browser and log in there, either remote or local LAN side?
One thing you can try, maybe, If the ISP modem supports it, you could change the modems DHCP server pool back to what you had been using. What was the IP address pool string you were using prior? 192.168.0.#?