mx 992 error 1007 only for 5x7 photo paper

[tater911]

So my mx992 gives the error code 1007 (no paper) in the upper cassette only for 5x7 photo paper. 4x6 paper prints fine as does full size photo paper in the lower cassette.

Canon wont support on th ephone so I thought I'd check here.

Thanks in advance!