Finally found my own answer. I kept trying to adjust the custom paper size in the printer properties. Although I set it at 3 wide and 5 high, and saved, I noticed it saved as 5 x 5. I had to delete the entire custom size and create a new one. With the printer custom size as 3 wide x 5 long (the short side has to go into the manual feed to work with the feed), and then in Word 2007, set up as a landscape document, it went back to printing my cards.
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