Hi Dave,
The cause of the warning message is that while loading the object from the MAT-File, MATLAB was not able to attach the listener back to the object. If you check for 'proplist' property of the loaded object, you will find it is empty.
A listener object is attached to the object as long as the object remains in scope. Once you save the object it goes out of scope, so the listener for the saved object is destroyed. In order to keep the listener with the object as it is saved and loaded back into the workspace, you will need to define the "LOADOBJ" and "SAVEOBJ" functions in your class definition file.
Please refer to the Help documentation on "SAVEOBJ" and "LOADOBJ" by typing the following at the MATLAB Command Prompt:
doc saveobj
doc loadobj
For more information, you could refer to the following MATLAB Answer: https://www.mathworks.com/matlabcentral/answers/99297-why-do-i-receive-a-error-loading-an-object-of-class-proplistener-warning-when-i-load-my-object-t
Hope this helps resolves the issue
