I noticed that the Undo, Redo and Server Connections icons (if replaced) now display correctly in 3.1.14 without reverting to the defaults. However, a new bug involving the Global Options has popped up.
If I go to change the Module Properties (to change the mod version and add a description) and click the Cancel button, the Global Options icons reproduce themselves in the icon bar of the game and the game will not operate properly when started.