It looks like your image could not be resampled.
Are you sure this is a gif?
[quote name='Mr VorniC' timestamp='1286041895' post='69512']
i tryed to set png format and i get a size more than 20k, do u know another format that are accepted???
[/quote]
Try making it smaller (it should then say png is not allowed)
If you still can't upload, use the [url="http://magicduel.com/ui/userprofile/sample_avatar_source.png"]sample avatar[/url] and export it as a transparent gif, then overlay your avy.