Hi! Did you ever find a resolution to this? I keep getting the error that when I try to save a Goal in the Script Editor, it says "ScriptItem has changes but is not writeable - This should not be possible!". I've been able to work on all of my scripts for the past couple of days just fine, but then this evening I couldn't save, and sometimes when opening my custom scripts it also said that the files weren't checked out. I've tried reloading, adding the script to my mod (they were already in there), checking out the files with the button on the editor, and nothing works. I can make a new file and copy the text over, but that seems like a huge waste of time. I also can't delete any of my custom scripts.
