True Image Cloud Backup reports "file is read-only"

After years of running smoothly one of my machines began reporting "file is read-only" a few seconds after commencing a backup to the Cloud.
I have tried creating a new backup to the cloud with only one file selected- still says read-only
I have tried removing the scripts in C:\ProgramData\Acronis\TrueImageHome\Scripts- no change
I have tried renaming C:\ProgramData\Acronis\TrueImageHome\OnlineBackup and recreating the backups- still says "read-only"
On this machine the backup to a local NAS box works fine. It is only the cloud backup that shows the error.
My Acronis True Image Cloud subscription is current; most screens show my expiry date is May next year. One screen in the "Storage State" area shows my expiry is May 2016 (last month).
I am running TI Cloud 2016. I notice that my Cloud storage is reported to contain 500 Gb of data. This machine has only 10 Gb of data for backup. I have used the cleanup tool but it found only 1 Gb of old files to remove.
Do any of the experts have a suggestion, please?


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Well, after about two hours online I got a response to the effect that "this is a known problem and our engineers are working on it." I now have to recreate my backup and send it all again. Over a 400 kbps connection that will take weeks. I just hope that I don't need to restore any files in that time.
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