Does your signature look like this in USERCP?
Quote:
[SIGPIC][/SIGPIC]
Text
Text
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If you miss the /sigpic code it usually doesn't show up right.
And did you host it outside, or upload it using the USERCP settings at the bottom of that page? I've found uploading works better than linking to a hosted image.
And keep in mind the size limit: "Note: The maximum size of your custom image is 700 by 200 pixels or 146.5 KB (whichever is smaller)."