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I've just tried this and mine is OK, so not sure why you are having a problem. If you are trying to add a graphic to the topic ensure that the modules/AMS/images/topics folder is write enabled (chmod 777). If it isn't, then this might be why it isn't working. Other than that, I can't help. Try posting at the developers site at www.it-hq.org - they have a forum specifically for AMS support - I've used it a few times and they're very helpful, and quick.