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I too have been having a similar problem since 2.0.14, and now 2.0.15.
I login and get taken back to the home page, when I log out I get told I don't have permission to access that page or some such similar rubbish.
I have followed the sessions table advice and no difference. There is a problem, and there is no point blaming cookies or nortons, this is a XOOPS problem.
Not saying I don't appreciate the advice given, but there must be a dev who understands what the problem really is and could give a straight answer.