Thank you for informing this issue. Actually JSON is a way that Trend Micro Security program uses to communicate with our cloud systems. As your description, we suspect that the Maximum Security program you're using is damaged somehow during the upgrade.
If the problem persists after re-installed, you can also call the Premium Support hotline at any time 24x7 and our support engineers will be able to work with you to investigate and resolve. Here's the web page that has the Premium Support hotline for North America: Ways to Contact Support- see "Call Premium Support" section