Cover Page printing

[keens312]

Hi mike,

We found an issue on Leopard.
When print a one-page-job with cover page, CUPS log shows this:

1. start RIP filter                  for cover page
2. start rastertoprinter filter      for cover page
3. start usb backend                 for cover page
4. start RIP filter                  for page 1
5. start rastertoprinter filter      for page 1

Questions is that why there is no USB backend started?
USB backend quit after cover page printed
The filter cannot receive any status message from the printer without the backend.