I use OpenOffice every day for my correspondence and envelopes. I am using the current version in Mint 5 and have used OpenOffice for several years in Mint, openSUSE, Mandriva, and a few others. I can print just fine and dandy.
I have a Canon s750 using the Gutenprint simplified s630 driver. There were three choices for drivers listed in relation to the s630. There was nothing for the s750, so I picked something close, and it worked. Perhaps the problem with your printing might be in the printer / driver choice. That is the fist thing I would check or fiddle with. I hope your problem can be fixed with one simple adjustment. Good luck.