What is your machform version? There was some changes with PayPal that caused some issue with the payment status not being updated correctly and updating your machform should fix the issue.
Also, you'll need to make sure that the PHP OpenSSL extension on your server is running version 1.0.1 or newer.
PS. For urgent enquiries, please open support ticket from your billing area and we'll help you there. This is community forums and we don't monitor this forum every day.