Magento 1.7.0.2 CE - PayPal IPN stopped working - magento-1.7

I built and maintain a Magento 1.7.0.2 CE online shop.
Magento is installed in a shop/ sub-directory.
Until a few weeks ago the PayPal IPN (Standard) changed orders from "pending payment" to "processing" without problems.
Now orders stay with a status of "pending payment" even when payed.
I changed the paths in
web-root/shop/app/code/core/Mage/Paypal/Model/Standard.php
from
$api->setOrderId($orderIncrementId)
->setCurrencyCode($order->getBaseCurrencyCode())
//->setPaymentAction()
->setOrder($order)
->setNotifyUrl(Mage::getUrl('paypal/ipn/'))
->setReturnUrl(Mage::getUrl('paypal/standard/success'))
->setCancelUrl(Mage::getUrl('paypal/standard/cancel'));
to
$api->setOrderId($orderIncrementId)
->setCurrencyCode($order->getBaseCurrencyCode())
//->setPaymentAction()
->setOrder($order)
->setNotifyUrl(Mage::getUrl('shop/paypal/ipn/'))
->setReturnUrl(Mage::getUrl('shop/paypal/standard/success'))
->setCancelUrl(Mage::getUrl('shop/paypal/standard/cancel'));
but that did not fix the problem.
A fresh Magento 1.7.0.2 CE installation verified that PayPal is configured correctly. The test order changed from "pending payment" to "processing".
Where else could I look to find the problem in the production shop?

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