I also have a white page. There is no error report because the page is broken by the php code. When I take the php code out the page loads fine. Pity Jack didn't say how he fixed his problem.
I've commented out these two lines ..
//virtual("/WA_DigitalFilePro/HelperPHP.php");
//WA_DFP_SetupUploadStatusStruct("WA_UploadResult1");
and the page loads. If either of those lines are not commented out the page fails to load. Any ideas?