Standalone Utility on USB Not Working - Build 2012

Hello -

I am attempting to create bootable USB drives with the Acronis Standalone utility in Build 2012.  Every time I create a drive the system is successful, but the target machine lists "invalid partition table" when I attempt to boot to the USB.  I have tried several different thumb drives, two different models of target machines, and have used diskpart to clean and reformat the drives to FAT32 prior to using the management console to create the USB drives.  Any ideas?