This problem came back about a 2 months ago. It only shows up if I print from Photoshop or Lightroom. If I print using the Canon Professional Print and Layout, I initially get an error message but the file prints fine. I can print to the Canon Pro-300 from MS Word, no problem. If I print from PS or LR, the print fails and I have to stop the spooler, delete the two files and then restart it again. Then it prints fine until I shut down the computer and restart, usually the next day.
Of course, that is as of right now. I've probably jinxed myself now and nothing will work......
I will reach out to Adobe and see if this is a known issue.