The 711WT printer puts white down only where it believes there is a color. Does this happen on all files, or just this one? Since you have a new printer with the same results, I would be looking at the other two variables. The file itself or how the file is being rasterized using the RIP. Try printing the file directly to the printer using the Oki driver and by pass the RIP altogether. You won't have the same feel since the RIP does change the image for a softer feel. If the white is back in registration, it may be due to how the RIP is modifying the file.