Problem for me too -- I use an external CAS authenticator and the ?repeat=w3tc is tacked on to the referral URL after it comes back from the authenticator. The user is authenticated but the referred URL indicates hs is not. I don't yet know where this is going wrong. I would have thought (hoped) that the default to 'never cache' wp-.*\.php should avoid trouble here. I also added wp-admin/* to cache exception list. Problem remains.
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