Hello everyone,
I am using the most recent version of zen cart and have many add-on's installed.

Today we had a customer who was getting a blank page when checking out via paypal, and after checking my cache folder for the logs, I found a number of interesting logs I don't understand.

Here's a selection of my logs:

Im getting one for SOAP:
Code:
[02-Dec-2011 09:36:36] PHP Fatal error:  Uncaught SoapFault exception: [HTTP] Client Error in /home/topper/public_html/includes/modules/shipping/fedexwebservices.php:175
Stack trace:
#0 [internal function]: SoapClient->__doRequest('<?xml version="...', 'https://gateway...', 'getRates', 1, 0)
#1 [internal function]: SoapClient->__call('getRates', Array)
#2 /home/topper/public_html/includes/modules/shipping/fedexwebservices.php(175): SoapClient->getRates(Array)
#3 /home/topper/public_html/includes/classes/shipping.php(136): fedexwebservices->quote('')
#4 /home/topper/public_html/includes/modules/payment/paypalwpp.php(2091): shipping->quote()
#5 /home/topper/public_html/includes/modules/payment/paypalwpp.php(1864): paypalwpp->setShippingMethod()
#6 /home/topper/public_html/includes/modules/payment/paypalwpp.php(1690): paypalwpp->ec_step2_finish(Array, 'Yes')
#7 /home/topper/public_html/ipn_main_handler.php(80): paypalwpp->ec_step2()
#8 {main}
  thrown in /home/topper/public_html/includes/modules/shipping/fedexwebservices.php on line 175
A paypal error:
Code:
2011-12-02 09:36:35
-------------------
(live transaction) --> https://api-3t.paypal.com/nvp
Request Headers: 
Array
(
    [0] => Content-Type: text/namevalue
    [1] => X-VPS-Timeout: 45
    [2] => X-VPS-VIT-Client-Type: PHP/cURL
    [3] => X-VPS-VIT-Integration-Product: PHP::Zen Cart(tm) - PayPal/NVP
    [4] => X-VPS-VIT-Integration-Version: 1.3.9h
)


Request Parameters: {GetExpressCheckoutDetails} 
Array
(
    [TOKEN] => EC-4J865551F2098244K
    [REQBILLINGADDRESS] => 1
    [METHOD] => GetExpressCheckoutDetails
    [USER] => sales_api1.topper.com
    [PWD] => ****************
    [VERSION] => 60.0
    [SIGNATURE] => ****************************************************nxOF
)


Response: 
Array
(
    [TOKEN] => EC-4J865551F2098244K
    [CHECKOUTSTATUS] => PaymentActionNotInitiated
    [TIMESTAMP] => 2011-12-02T16:36:35Z
    [CORRELATIONID] => 551e409492782
    [ACK] => Success
    [VERSION] => 60.0
    [BUILD] => 2271164
    [EMAIL] => [email protected]
    [PAYERID] => D5WEBJRFG5P5Y
    [PAYERSTATUS] => verified
    [BUSINESS] => ZZZZZZZZZ
    [FIRSTNAME] => Bruce
    [LASTNAME] => ZZZZZZ
    [COUNTRYCODE] => US
    [SHIPTONAME] => Bruce ZZZZZ
    [SHIPTOSTREET] => 280 ZZZZZZZZ Drive
    [SHIPTOCITY] => Dallas
    [SHIPTOSTATE] => GA
    [SHIPTOZIP] => ZZZZZZZ
    [SHIPTOCOUNTRYCODE] => US
    [SHIPTOCOUNTRYNAME] => United States
    [ADDRESSSTATUS] => Unconfirmed
    [CURRENCYCODE] => USD
    [AMT] => 3000.00
    [ITEMAMT] => 3000.00
    [SHIPPINGAMT] => 0.00
    [HANDLINGAMT] => 0.00
    [TAXAMT] => 0.00
    [INSURANCEAMT] => 0.00
    [SHIPDISCAMT] => 0.00
    [L_NAME0] => Solar Stat Window Tint and Applique liquidation lot 27,000pcs
    [L_NUMBER0] => SolarStatLot
    [L_QTY0] => 1
    [L_TAXAMT0] => 0.00
    [L_AMT0] => 3000.00
    [L_ITEMWEIGHTVALUE0] =>    0.00000
    [L_ITEMLENGTHVALUE0] =>    0.00000
    [L_ITEMWIDTHVALUE0] =>    0.00000
    [L_ITEMHEIGHTVALUE0] =>    0.00000
    [CURL_ERRORS] => 
)


GetExpressCheckoutDetails, Elapsed: 718ms -- Success
I'm very concerned about this... because I have no idea how many people are getting blocked, I see a TON of these error logs.