Rotating Collate will be canceled when:
Jobs containing pages of various sizes are set.
A paper tray is specified.
Cover sheet function is enabled.
Slip sheet function is enabled.
Custom size paper is set.
When Collate or Rotating Collate is specified in the printer driver, make sure [Printer Collate] is selected for the PCL 6 or PostScript 3 printer driver, or the [Ignore Application Collate] check box is selected for the PCL 5e printer driver. Otherwise, the output may not come out as desired.
For details about setting the collate function using the PCL 6 printer driver or PostScript 3 printer driver for Windows, see Output Settings.
For details about setting the collate function using the PCL 5e printer driver, see Setup.
For details about setting the collate function using the PostScript 3 printer driver for OS X, see Printing with OS X.