Firstly thank you very much for your fast response.
I just tried HP Photo Creations.
In HP Photo Creations I selected from the pull down options in "Choose Size" the option 4 x 6, hence the photo size is correctly set.
Unfortunately when I want to print this 4x6 photo I run into the same issue: On the left hand side in the "Paper Size" pull down menu selection there are no photo paper sizes, just the choices you already have in "Printer Preferences".
I have 4x6 paper and this size is not available in the pull down. It really seems to be a driver issue due to missing photo paper sizes that prevents all SW on no matter what OS to print on 4x6 paper. For example I just tried PowerPoint which I set to 4x6 and when I go to "Printer Properties" and then to "Paper/Quality" there is no photo paper choice in "Paper Size".
Anything else I can try?
Mant thanks in advance!