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For one, I went to your Website and tried to register, but as soon as I press the button "Submit", I am getting a blank page. So obviously, something is wrong.
Did you install any new version of XOOPS or any of the modules?
Do you know if the Host provider changed anything on the configuration, e.g. updated to PHP5?
You definitely need to set the debugging on to see what is happening. Try to follow this advise on how to make it happen:
https://xoops.org/modules/smartfaq/faq.php?faqid=80
and then let us know what is happening.
Check also this thread:
https://xoops.org/modules/newbb/viewtopic.php?post_id=182074