I've had my IPF5000 for over a year and have put perhaps a dozen rolls of 17 inch roll paper through it with no problems.
Last week, I put in a roll of 17 inch Photo Rag that I'd used before and the printer would not recognize it as 17 inches wide. The status monitor displays "Custom Size" instead of "17-in Roll."
As a result, it won't print borderless on this roll. If you force it to print by pressing "online" several times, it prints with a 3mm border on the sides.
I tried cycling the AC on and off on the printer and removing the paper and putting it back in again, but nothing helps.
Other rolls of paper work just fine.
It's just this one roll of Photo Rag that seems to be the problem. I've printed on this roll of paper before and didn't have any problems.
I called tech support at Canon, but they didn't have any answers.