I have always used Print Studio Pro with my Canon printers - with no issues. Suddenly it doesn't print in either Lightroom or Photoshop. It appears that the printer recognizes the file as the file name appears in the printer LCD and the printer appears to be getting ready to print (all of the usual noises and advancing the paper to print). However, it just ejects the paper without printing. I have uninstalled and reinstalled ALL of the Canon printer drivers - the problem remains.

I am able to print from both the Photoshop and Lightroom "Print" dialog so I do know that the printer is communicating with the computer.