I get "Reason: The user who attempted to complete the task is not the user to whom the task is assigned." as the error occured, but this only happens randomly, roughly 50% of the workflows error out with above error with no apparent rhyme or reason as to
what causes it to error.
Notice creation by a secretary fires off the workflow, which then gets approved by the attorney, and then it errors with above message, but only 50% of the time and in apparently random order.
SharePoint 2010 Enterprise, SQL Server Enterprise R2
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