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When copying the code to your signature, it should look something like this:
[url=http://sincemylastcigarette.com/][img]http://sincemylastcigarette.com/banners/1365069600_2_20_USD_12_default.png[/img][/url]
I looked at your signature block and yours looks like this:
[url=http://sincemylastcigarette.com/][img]http://s
You didn't get all the code copied. Try again.