If you are having trouble with users accessing content, check out the node_access table and make sure all permissions are set properly. Unless you are using modules like Organic Groups which set the node access permissions by user, you will only need one row on that table, with user id 0:
Restore permissions:
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TRUNCATE TABLE node_access;
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INSERT INTO node_access VALUES (0, 0, 'all', 1, 0, 0);