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When creating a PDF report ticking the box "Send to me" causes the email to be sent to the superuser not to the report creator. This is because when the email is sent, it uses the email address of the "current user" which is likely to be the superuser when run from a cron job.
Attached is a patch for plugins/PDFReports/API.pm
patch to API.pm.txt
(In ) fixes #1685 - thanks duncanc; btw next time, please make your patch against svn and preserve whitespace