Quote Originally Posted by Carbonless View Post
My clients store is ZC 1.5.7c using OPC 2.3.9
upon clicking checkout, I'm getting a page reload with the following display:
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and once I click ok:
Im brought to the checkout screen, but not ble to select the payment method:
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the following debug error: 06-Nov-2021 01:16:36 UTC] PHP Notice: Malformed value for session-based shipping module; customer will need to re-select: false in /includes/classes/order.php on line 323
Looks like you've been bit by this (https://github.com/zencart/zencart/issues/4478) Zen Cart core bug, where 'storepickup' is the only shipping method available.

I'll see what I can do later today to provide a solution.