stuck on shopping_cart page.

[sungmo]

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I am using zen 1.5.1.

I met a problem after migration from 1.3.9 to 1.5.1.

Some customers do not have problem to order.

Some customers have problem to order. they stuck on shopping_cart page even though they click "Checkout" button.

However, new registered customers do not have a problem to order.

I do not know why.

there are someone who has experience this problem before? if so please let me know.

[mc12345678]

Have you tried using the unmodified default classic template to see if the same customers are having a problem? Did these customers have one or more items in their shopping cart before the upgrade? Did you try to upgrade to anything more recent as 1.5.1 is nearly 7 years old if I remember correctly.

Though not entirely sure if it is related, but what php version is being used?

Are the ones having problems only previously existing customers? Is there a browser type that is consistent? Have there been any changes in session handling?