Something installed is conflicting by either altering the session data, the POST data, or both. I've no idea what exactly installed is doing it though. You do however have Joobi installed, which is known to cause problems like this in the past. Best I can suggest is disable everything 3rd party that's installed except CB and see if that resolves it. If not create a fresh Joomla + CB only install in a sub-domain or sub-folder on the same host and see if issue persists, which will help confirm if it could be a server configuration issue.
Kyle (Krileon)
Community Builder Team Member
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