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When turning on debug view with the plugin enabled, discussions break completely. The reason is that the plugin uses the now deprecated
DiscussionController->CommentData on line 90 of class.thankfulpeople.plugin.php.
Changing it to
Data('Comments') seems to solve the issue – the whole line would be:
$CommentIDs = ConsolidateArrayValuesByKey($Sender->Data('Comments')->Result(), 'CommentID');
After the fix the discussions display two bits of debug info though:
Comment.Page.30.33.1: array ( 0 => '2014-08-05 09:05:41', )
Not sure if that's important.