I deleted your old signature for you. It contained some font tags which are not supported anymore in signatures, and that was probably creating the problem. You should be able to enter a new one with your user control panel.
Click on the little control panel icon below the main nav bar, next to where it says Welcome, Clixphoto. (Log out). In the left sidebar, look for Settings and Options and click on Edit Signature. Create your signature there and hit save.
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www.clix-photo.com