Now this may strange but can you try saving my avatar from this page and then try uploading it as your own? (That way we can work out whether it's the image or the upload process that is going awry.)
i tried using your avatar pic, they hasn't worked either, dont no if this is any help, but when i select whatever image i'm going to be using, the locatoin of that image appears in the "current avatar", box then after you click the update button the current avatar box is blank, as if the image hasn't been saved/uploaded, hope that makes sense
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