admin order Refund showing blank page

[wingsryder]

New feature Order refund giving error while working with live credentials. Once you click Capture Order from admin section if show blank page. once we revert back to old version all work good.

Also this extension wok fine on test server with sandbox credentials,however on live its not.

[stevecrozz]

Can you enable debugging http://www.blog.magepsycho.com/configuring-magento-for-development-debug-mode/ and send me any log output you find (either in ./var/log or just in the browser)?