The problem is that when a user has selected to go directly to the forum view or post display after posting (instead of a confirmation page), post_reply_post prints the redirect and returns nothing, since there is no possible template to use the return value.

What you might try instead is looking at the insert_post hook, called in GForum/Table/Post.pm - this hook gets called for every post insertion, regardless of where it comes from.

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Jason Rhinelander
Gossamer Threads
jason@gossamer-threads.com