I would like to pay your attention to the Model Editor - Custom editors invoked from the property inspector did not save any value issue, which you may encounter in the version 13.1.6. 
Basically, it may prevent you from modifying model properties like ImageName, Criteria, Filter, EditMask, Settings and others, which use wizards instead of plain editors in the property inspector. 

Note that it is still possible to change a property value by typing it manually, i.e. without using wizards:



Good news is that we have already fixed this problem and you can
download a patch from here.
In any event, let me take this moment to apologize for all the inconvenience here.