Can't print on A6 paper

Hi

I'm trying to print a flier on A6 paper on an HP CP1515n. I set the paper size in Corel 12 to A6, then set the paper size on the printer to A6. The paper feeds through very nicely - with nothing on it.

It works fine printing from MS Word so I am placing the paper correctly.

Using XP Home Edition SP 3

Please - any help you can give me would be most appreciated. I am currently printing on A4, then cutting into 4. I have found a cheap source of A6 paper but can't get my fliers to print.