Save and stow no longer available

I can no longer save or stow a module in natural one. When I right click on the module the “SAVE” is grayed out. Not sure what I have done to cause this.

I haven’t noticed this before, but apparently the Save option is grayed out until you make a change to the program source. Same as for the Undo option.

However, you can Stow even without changing anything by right clicking on the module name under the Natural Navigator and selecting NaturalONE → Update.