Update: Version 1.2
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1. Added the correct templates to be cached.
2. Fixed the Quick PM Reply form so that it works when WYSIWYG is fully on.
3. Fixed the Delete PM button bug.
4. Removed the Message Tracking checkbox option - we are back to Popup Windows. (I'm trying to keep the hack simple).
To update:
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1. Revert pm_newpm template to default - we don't have to change this anymore.
2. Replace the PHP code in private.php
3. Edit pm_showpm template and move $quickpmreply to the very BOTTOM of the template.
Done!