did you restart the Mac before deleting those things? Prefs are under control of some daemon, and may not be written to disk when you think they should.
is Editor trying to open the document that was open when it crashed? If so, deleting that might help.
I duplicated the file that caused the crash and then deleted the original file.
After a restart I can use the Editor again and also could open the copy of the file.
Then copy and pasted everything to a fresh file.Seems to work again.
I am glad it worked out like that.
Reminded me to keep versions of scripts in various states to have he possibility to go back if necessary.