Saving layouts on shuffleboard

Is there a trick to saving and reloading a layout on shuffleboard ? We can save a layout and the json file appears to be correctly populated , but if we quit shuffleboard and reload the saved layout is not loaded .
We are running windows 10 and using the new 2019 version of shuffleboard.

Which version of shuffleboard? 2019.1.1 or 2019.2.1? The kickoff release had a bug with loading save files

Thanks - that fixed the problem !