I don't what changed on our side yet, but I'm getting a lot of support requests from members using old versions of NextPVR. (V 7.0.2 is current). Initial troubleshooting shows they are not sending valid JSON for login requests or setting the JSON content type. If you can't upgrade, you can download data using XMLTV.ORG tools and then import it into NextPVR.
I'll update this annoucement once I have more information. -- RobertE