HP C310
model name: CN503A
Mac OS X 10.8
When attempting to print #10 envelopes from Microsoft Word, my HP C310 streaks ink on the printing surface. I can print the same text on 8.5" x 11" paper and it is good but the envelopes are unuseable.
Page setup: #10 envelope
Destination paper size: #10 envelope
Please advise.