Tried to open a .ODS file and it’s BackUp, got a message that this file wasn’t available because it had been blocked.
Not much more info than that.
All other .ODS files were not effected and opened with no problem.
2 Hrs on Google and info was that the problem was the SOFFICE.BIN of AVAST.
Tried to alter the permission as instructed … NOGO.
Updates AVAST … NOGO.
Thought of deleting AVAST and re-installing.
Rather - turned off AVAST, opened the original .ODS file, copied info and pasted to new.ODS file.
Deleted original.
Everything is OK.