Imported From: http://groups.google.com/group/in-portal-bugs/browse_thread/thread/b5f1ba5ed6696cad#
When doing a complete cache reset an admin tree sections are rebuilt as well.
However in the process OnAfterConfigRead events are called too resulting code listed there executed once more.
This doesn't do much harm, unless you're adding values to unit config (e.g. adding LEFT JOIN to sql) instead of replacing them. As a result double LEFT JOIN is added causing SQL error.
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