I've checked the basic handling, using Zen Cart 1.5.5e and the responsive_classic template, for Chrome and did not find any issue.
What I did was:
- Login, ticking the "Remember me?" box.
- Added a product to my cart.
- Went to checkout (sitting on the checkout_shipping page)
- Went away for a while, allowing the session to expire.
- Came back, clicked the "Continue" button and proceeded to Checkout/Payment.
If you'll provide a specific set of actions that you've taken to reproduce the issue, I can make more progress.
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