Duhhhh. . . .
OK, this has to qualify as the dumbest post and thread I ever initiated. (To be clear, I am criticizing myself, not any of those who responded and corrected me.)
I never realized that the last release of APS allowed for sheets as small as 13x19 or smaller. Many months ago someone argued that it was impossible to change the APS to use sheets that small, and the best we'd ever get is 17" rolls. He claimed to be in contact with Spain. I was convinced.
So it just never occurred to me that he was wrong, and the APS now does sheets.
I just finished using two 13x19 sheets, and just like you said -- it works.
One other observation, but you all probably know this. Use the default setting, not the fit to page setting.
I was getting error messages last week on a 17x22. I'm guessing it was caused by using the wrong setting, so I'll try the default setting next and see what happens.
Thanks again to Chris Anderson and ItPhoto for setting me straight.