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Locked threads shouldn't have an edit button on your posts, that's the bug. I don't think you can unlock your own threads, you need to get an administrator to do it for you. There's a workaround - if you click on the post number to get the post on its own page, you get the editing box and you can save changes after making any edits required. I've tested this on one of my locked classified threads, and it works for both the first and subsequent posts. To edit the thread title, click on the "Edit Conversation" button in the right margin.
both - but seems to just be in classifieds when i cant amend the original post