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There seems to be some mechanism which is automatically logging users out of TRAC. This means that they end up posting as "anonymous" because they don't realise they are logged out. Probably there is a session cookie which expires or something.
To avoid this, we could either try to change the logout (I would be happy if the automatic logout was just disabled completely), or make it much more obvious when you are not logged in.
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Does your browser maybe forget cookies when closed? That is sometimes the default for some browsers.