The emails notification will not be send if email template will not be set up on the workflow configuration: Depend on if the workflow is global or company related there are different ways you need to set it up: For the company related workflow you need to set it up in: Organization administration > Setup […]
The issue occurs when installing the Enterprise Portal on a claims web application, so actually you will also face the same the issue on SharePoint 2010 when using claims.
If some of the users experience the issuewhile running an auto report even with minimum amount of data, that can because by the client configuration used by the user.
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