There are a few ways to diagnose issues with the node pack. On launch the console should already provide enough information regarding potential issues, but there are a few other options:

Enable Debug Messages

There is now a setting in Comfy setting page to enable or disable debugging of the node pack:

This will effectively enable both backend and frontend debug logs

Check the status page:

If you go to /mtb/status (for instance http://localhost:3000/mtb/status), you will be presented with a page showing the node that successfuly loaded and the ones that failed