Fix Persistent Login Bug

I need a developer to troubleshoot and repair a functionality issue that is blocking every user from logging in or registering on my site. The failure happens every single time, so you should be able to reproduce it immediately and trace the root cause without waiting for an intermittent glitch.

Once you locate the problem, I expect a clean fix applied in the codebase or configuration, followed by a quick verification that both login and sign-up work reliably across modern browsers. A brief summary of what was wrong and what you changed will complete the task.