Can only open Calc in read mode

Since updating have not been able to open spreadsheets but have a message saying:
Document could not be Locked.
“The lock file could not becreated for exclusive access by LibreOffice,due to missing permission to create a lock file on that location or lack of free disk space”

I have not altered any settings and have over 5GB of frre disk space so how can I restore to normal working?

Maybe another case of AVG / Avast blocking LibreOffice?
tdf#157835

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