I wonder if the choice of icc paper profile when the printer was first loaded into QIU makes a difference.
Peter, Remember, QU reports on its screen what the driver reports to QU.
Printer profiles usually get placed in a Windows folder called C:\windows\System32\Spool\Drivers\Color
In the case of using a profile, you would set the driver to NONE.
Then select the appropriate printer profile from within QIU, in the appropriate location. (See snap)
This controls what print data will be sent to the driver. It would have no effect on what settings get "Grayed Out" in the driver.
I feel strongly that the 64 bit driver, is designed that way, whether by accident or design.
One more comment, I have a number of Canon Printer drivers installed so I can possibly help someone set his driver properly when the prints come out weird.
Usually, they have Scaling turned on.
However, all these drivers are for my 64 bit Windows, and even the $3000 + models will not reach 1200 x 1200.
Logically, there would be no need for a higher output resolution especially with large prints, making only unacceptable file sizes.
According to the Canon Driver download page, the 32 bit driver is a different breed.
http://supportdrivers.info/imageprograf-pro-1000-driver-download/If anyone with a 32 bit Windows machine wants to try it see above link.
Fred