I am still on 2018-1 beta test - is that the "Newer version" in the message - If you still can't open it - attach it to a post and I will open it and save it back to something you can open
Thank you very much for the follow up and the offer of assistance. Unfortunately, my workbook had sensitive info and so I requested IT retrieve it from the backups.
Thank you again.
Understand - Glad you got a solution
Don't really understand why my 2018 still works and yours does not - I think there was and update to the Beta - did you go back to the test site and update yours?