"Error Initializing PanelPro" upon JMRI Startup


 

Howdy,

After not opening JMRI for a few weeks, I tried the other day to open PanelPro (to use OperationsPro) and promptly got a completely blank popup entitled "Error Initializing PanelPro" that I had to use Task Manager to close. Have tried multiple times since and even uninstalled then reinstalled both Java and JMRI and still get the same error. I've searched this group and the manual to no avail.

Running Java 11 and JMRI 5.2 on Windows 10, afaik

Any ideas how to resolve?

Thanks,
Isaac