Pro Site not upgraded after payment received

I just noticed an issue that appears to have occurred out of the blue, since otherwise Pro Sites seems to be functioning properly and has been for quite some time. Below is some information I hope will help resolve the issue. Please advise of any other details I can provide to help troubleshoot. Thank you in advance for any help.

Overview:

We have a member site that was originally registered 2012/06/02. Today (12/14/12) we received a Paypal payment and notification for a Pro Site level upgrade. We did NOT, however, receive an automatic payment profile notification. No subscription was created, nor was the site upgraded (ads removed, plugins activated, upload space increased, etc.). The Supporter Upgrade page for the site indicates no current Pro Site level. Other Admin notes follow…

Manage Pro Sites Management:

Manage Site : Adventures of Lupedog (Blog ID: 1932)

“Adventures of Lupedog” has never been a Pro Site.

Account History:

2012-12-14 5:13:06 pm Payment receipt email sent to email@changed.com

2012-12-14 5:13:05 pm PayPal IPN “Completed” received: $25.00 express_checkout payment received, transaction ID 8TJ76364CM2030113

2012-12-14 5:12:56 pm User creating new subscription via PayPal Express: PayPal returned an error*:

*No error message included!?

IPN Forwarder Log Entry:

[2012-12-14 17:13:05] Successfuly sent to tripawds.com/wp-admin/admin-ajax.php?action=psts_pypl_ipn: transaction_subject=Tripawds+Supporter%3A+%2425.00+USD+every+12+months&payment_date=09%3A12%3A44+Dec+14%2C+2012+PST&txn_type=express_checkout&last_name=NameChanged&residence_country=US&item_name=Tripawds+Supporter%3A+%2425.00+USD+every+12+months&payment_gross=25.00&mc_currency=USD&payment_type=instant&protection_eligibility=Ineligible&verify_sign=A9W18EQFIAn9xP.78mk-bcorkj4ZA6EzQIglFDPPsAf8WEwkwWCSEc6w&payer_status=unverified&tax=0.00&payer_email=email9%40changed.com&txn_id=8TJ76364CM2030113&quantity=1&receiver_email=myemail%40changed.com&first_name=Name&payer_id=8KWPXNBATFTDE&receiver_id=YYC8CW7FKU5SY&item_number=&handling_amount=0.00&payment_status=Completed&payment_fee=0.85&mc_fee=0.85&shipping=0.00&mc_gross=25.00&custom=site3_1932_1_12_25_USD_1355505161&charset=windows-1252&notify_version=3.7&ipn_track_id=a2e1884e278ca