Cannot move posts to TRASH from within a thread

If I go into a thread and try and delete a post inside it using EDIT button next to Quote.

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When the pop-up box appears after clicking Move to Trash and then try and click OK to move it to Trash it does nothing at all

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Yep, I was to say same. Can only be restored when "moved to trash". If you delete it next after that, then it's permanently deleted. But even moved to trash gets emptied (permanently deleted) after so long passes set in admin cp for it.