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We have a Magento Community 220.127.116.11 install with PayPal Standard configured. IPN in PayPal is set to http://domain.com/paypal/ipn/ and auto-return URL to http://domain.com/paypal/standard/success/
It has been working for 6 months OK but in the last two weeks SOME orders via PayPal are not being saved in Magento and others are taking the customer through the PayPal process and back to the website to an empty cart - order not placed and payment not taken. Other orders are coming through as Pending Payment.
We need an experience Magento expert to resolve this issue. We can see there are other cases of this in the Magento forums.