Backups getting corrupted when using Encryption

Recently, I setup three new backup schemes using file encryption. I also setup clean items for 3 version chains, creating a full version every 6 days. All three are identical setups on different machines in different locations on different networks, i.e. all running the full version of True Image 2015 with the latest build.

I can't tell for sure but if this is the catalyst but it seems after the first clean up happens that the backup archive is reported to be corrupted.

The error message is: The backup is corrupted, but you can still try to recover data from it.

In all cases, I end up having to delete the settings and recreate a new backup scheme. Needless to say, this is very frustrating and clearly appears to be some kind of bug related to the encryption being turned on.

Unless someone can point me to some settings conflict.

Regards,

John Stephen