Pahu:
You seem to be the expert in the Canon iR C2880i as it relates to the Mac. For what it is worth, a couple of years ago I experienced a problem getting my Mac (pre SL) to communicate with my office's Canon C2880i, but an exhaustive search via Google lea me to many discussions that you had written to many people, that helped me to find a driver that would allow me to print (albeit not the "normal" Canon driver for my printer). You should know that many find your help useful, even months or years after you provided that help. Your assistance has not gone unnoticed.
As luck would have it, my computer recently began having issues printing to this same printer and I, as many others, have begun to wonder if it had something to do with the upgrade from 10.6.3 to 10.6.4. My error came in the form of a pop up screen (much like a syntax error) listing a "cupstomcdUFR2" error with a slew of technical data I cannot even begin to understand. A bit different for other's errors and I do not recognize how they see "error -83" (for example - not a real error number). Regardless, my print options now have shrunk to zero. I have tried everything you have suggested to others, except the PS option which my printer does not support (at least is not shown when I use the web to access the printer as you have suggested to others). I have gone into my "Library" and deleted the files you suggested and re downloaded the "new" driver from canon for this printer, still the same error. I have tried other drivers that I thought might work, but most random picks either did not work to even allow the printer to communicate, or the print was colorless. Seems I recall the original driver that I did get to work always gave me a pop-up requiring a user name and password. I also just used "1" for the user name and left the password blank. Not sure what driver I used, but at least it worked. Well, not anymore.
BUT, either in this or another help string, you listed the web link for the UK version of the C2880i. Much to my surprise, when I went to print a color "test" document, it worked. Not sure why, not sure for how long. But, for now at least, it does work. I have begun a long download of a much larger 10.6.4 file which apparently has some "fix help files" in it in order to help troubleshoot certain problems. The file is much larger than the normal update Apple sends out. If I have print issues again, I will run the download. One forum site suggested that this file may help as it has done for others. We will see - or hopefully NOT see because your UK driver works!!
I just wanted you to know of my issues and what fixed (hopefully) it for me. But, any thoughts or suggestions would be helpful, in case I or others have more problems. I look forward to your response!!
R/
RND
Virginia, USA