For troubleshooting purposes, you can set your Little Green Button to forcefully take on the role of Master.

Do this by holding down your Shift key, and Right Clicking your Little Green Button.

This brings up the context menu, with some additional options.

Click Subnet Master Pin ...

Select any of the 3 options to Pin the Master role to your button for the desired period of time, and press OK.

The Technical Information will reflect your change.