When this happens I either close and re-open or if this doesn't work use " file/save as" and give it a slightly different name. WAlanhen I am happy that all is well I delete the old file and "rename" the new one with the original name, if need be.
-------- Original message --------
From: Sam Warren <[hidden email]>
Date: 31/10/2019 01:13 (GMT+00:00)
To: [hidden email] Subject: Read Only files