Hello, I think I find workaround.
I had similar problem:
Errors: [ Failed to process file duplicati-20180221T192419Z.dlist.zip.aes => Hash mismatch on file "d:\Duplicati2_TEMP\dup-2cce5e16-d8f3-4416-ae21-cced08df2e4d", recorded hash: jm9haTFVB2As8Fg4rv9EwMBfsUbzEtDyap+CqYfmRXw=, actual hash 64D7qPZTijzv9qgmnOumGmPYPE74tzRxlFBto0h19bI=
I tried backup, verify, repair, upgrading, deleting all temp files… nothing helped…
So I run DuplicatiVerify.ps1 from C:\Program Files\Duplicati 2\utility-scripts
And after couple minutes I saw:
*** Hash check failed for file: duplicati-20180221T192419Z.dlist.zip.aes
So I renamed that file. Run backup. Duplicati told me to run repair so I did. And after that error message was gone.