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Looks like the avatar directory perms need adjustment.
And the sitejump at the bottom needs a tweak, change thzclan.org to thzclan.com, I let the .org go.
When I try and upload a new avatar the error comes up. My avatar, and sharps (at least), show broken images in browsers like Chrome that don't hide broken images.
Try and upload an avatar, that is when it is trying to write the file to the directory.