A few users in the forums are having issues with Emails with PDF reports not sent automatically, when cron is not setup.
Piwik tries to trigger the PDF emails automatically in the Task Scheduler.
We should make it easy to enable Debug information, and log it in a file with the current date in the filename, in piwik/tmp/
Then users could send us their log files when having specific problems like this one.
Logging might have to be customized by module to limit noise. For example, enable debug logging only for "TaskShedule" hook, or class.
THis ticket is about
another report (there are many like this one...) http://forum.piwik.org/read.php?2,73622