This has been happening for about 6 months now and my troubleshooting research hasn't amounted to much. There seems to be out of place marks on the right hand side of the printed page. The marks are always present, but at varying degrees of visibility. Sometimes it'll be almost entirely not visible and other times it'll be as prominent as anything else on the page. It happens with both color and black & white prints. I am using the Canon brand toner cartridges. Any help would be greatly appreciated. Thank you.