paper size problems

Hi everybody, here's my problem

I usually use two different printers A and B with two sizes 1 and 2.

The problem is when I use A as default printer, size 1 becomes default paper for both printers even when printer two has size 2 as default.

And the problem persists if I do it the inverse way.

It doesn't mind wich paper is the default on each printer, all the applications I use take as default paper size the size of the printer markes as default.

I've tried everything and I can't solve it. Any ideas?

Thx in advance.