Not coming from CB, but from Joomla it self. This happens when a Joomla content article link is rendered without an Itemid and SEF is enabled. If you're using the built in content author plugin try replacing it with CB Articles. If using CB Blogs ensure it's up to date. As it's happening on registration it's possible it's coming from a module though.
Kyle (Krileon) Community Builder Team Member Before posting on forums:
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It was a problem with virtuemart who doesn't finished the installation upgrade process on my case .. and seems to be the reason because now this disapared. so problem solved .
Thanks )
krileon
so problem solved