PGP WDE on a stick

Hi,

I'm trying to create a BartPE image with the WDE drivers in place. It appears that it works if burned to CD using the oscdimg tool as mentioned in tech note 200751. However, if I try to take the same BartPE build and attempt to write it to USB using YUMI or UBUSB (from UBCD4Win), it triggers a BSOD with 7B exception (INACCESSIBLE_BOOT_DEVICE). Has there been any way to do this successfully?

Thanks,

Kevin