Could be a number of things.
1) But try creating and saving/re-saving some other types of test files in other programs...Notes, Excel files, Word files...new pictures...or anything with a bunch of characters, data in it. If it happens for other files, then perhaps your SSD is at end-of-life. SSDs apparently go into read-only mode when ready to fail....to give you time to back up all your files before replacing the SSD, or moving to a new computer.
2) Do you have multiple logins for that computer? Sometimes logging in as a Guest is Read-Only for certain files
All I can think of for the moment...unless you somehow set the sub-directory your file is located in as Read Only
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*
