Solution
Do not use the following types of paper. Using such paper will not only produce unsatisfactory results, but can also cause the printer to jam or malfunction.
Folded, curled or wrinkled paper
Damp paper
Paper that is too thin (less than 64 gsm or 17 lb)
Paper that is too thick* (more than 105 gsm or 28 lb)
*non-Canon branded paper
Picture postcards
Postcards with an affixed photo or sticker
Envelopes with a double flap
Envelopes with pressure seals
Envelopes with an embossed or treated surface