canon mg6150 printer won't print with word on my macbook air

Hi

I have a Macbook air and my printer is a canon 6150.

When I go to print it doesn't always print out properly when I am using word and adobe pdf files. It seems to print ok when I open documents in preview.

I have been on the phone to canon and reinstalled the printer drivers and tested the printer by doing a colour copy and printing on my phone. Both of these work. As these work the cannon dude says its something to do with the setting in my computer rather than an issue with the printer.

What do I do now?

Thanks