Those forums have a size limit on uploaded avatars...they should be 80 x 80 pixels, or they won't upload. The same applies for linking to off-site avatars, like those hosted on photobucket. Signature files are also to be no larger than 300 x 150 pixels. If you're linking to an off site avatar or signature image, use the [ img ] tags (without the spaces), not the url link.
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