sync error processing uploaded date report id: af4be5b6

Sync was working fine for me until I installed the latest software update today. Now it won't work anymore; I get an error message as followed:
Last error: error processing uploaded data (report id: af4be5b6)
I shut down and started up again, with the same error message.

Any ideas? Or any ideas how I go back to this morning, before I installed the new update?

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