This is a new 1.51 install on a windows server using php 5.4.10

It all seems to be working ok up until the point i try to place an order. I'm using the payment module from plugnpay. Once i submit the order i'm taken to index.php?main_page=checkout_payment and the page is completely blank. Looked at the source code in browser and nothing is rendered to the browser.

There is a however a value for error_message in the url, which indicates the card was not authorized. Not sure why that's happening since it's all in test mode and i'm using a test credit card. But in any case, i'm assuming the page should display some sort of use friendly message, maybe a copy of whatever the error_message is.

Any suggestions as to why this one page is going blank? There don't seem to be any error messages in the log folder generated as a result of this page.