Sometimes this happens. If the initial leading edge cut is not at 90 degr the paper may drift, there is a tolerance on the loading measurements. One way to check is with the paper move choice on the printer panel, rolling the paper 3 feet forward and back twice and check the blue line against the paper right edge. Sometimes it heals the issue, sometimes you see already that it will go wrong in printing. The loading system goes a similar route too if there is an issue with loading. It asks to raise the paper clamps handle and then pulls the paper straight on friction with the transport axle, I usually put a finger in the middle of the roll then as well. Yesterday I had the paper drift with a 24" Museum Etching roll that I had rolled backwards to get the curl at the leading edge flattened, the head smudged that part before I did that. Now the paper drifted to the left but no smudge. So I cut the leading edge at 90 degr at the board cutter, made sure the roll was evenly rolled and used the custom (1.5mm thick, 14.5 cm diameter) polycarbonate disc for the left side adapter of the spindle that I made for cases like that. I just adds that slight guiding to a roll that needs it, usually the rolls that have a wider diameter than the spindle adapter has. I should make more for the 4 spindles I have.
Met vriendelijke groet, Ernsthttp://www.pigment-print.com/spectralplots/spectrumviz_1.htm
December 2012, 500+ inkjet media white spectral plots.