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$plugins->run_hooks_by_ref("admin_forum_action_handler", $action);


Should be

$plugins->run_hooks_by_ref("admin_forum_action_handler", $actions);


Causes problems with plugins of course.

Either this has already been reported and fixed for 1.4.5 or your running old files. I just checked the SVN, it's already there.

Alright if this has been already fixed.