Cant believe it cant print even though it sees my printer

I have a Canon MX860. After I added the printer manually by its IP address, the app sees the printer but it just wont print to it. One sad feature I noticed is that the setting is primarily for letterhead. You cant select a particular sheet size. At least I didnt see any options for it. $1.99 wasted

Alansam67 about Print Magic, v2.4.1