Hi Ethan,
I've replied to you private e-mail to me. Just to reiterate here, this is nothing to do with Ceon URI Mapping, it does not interact with any login functionality of Zen Cart. This must unfortunately be a mistake you made when upgrading from 1.3.8 to 1.3.9f. Hopefully you can find the right answers/support or another thread.
All the best...
Conor
ceon
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