I have exactly the same problem as was discussed above.
My single Signon using forms based authentication on a Windows server was working fine with vB3.8 for a year or so, but with vB4 the do_login_redirect triggers an infinite redirect.
My code transparently creates a vB account or logs the user in if their email address matches between vBulletin and my CRMS. I execute the login and my code with a button and it works fine, but if I have it fire from a hook, it gives the infinite redirect in v4.
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