I have had my share of trouble printing from iphoto. I went to adobe photoshop and all is well. Ifwou don't have it, it is worth it to buy a copy of elements 4. I also discovered that if I drag my photo to the desktop then open it in preview I can work with it easily. In preview, under file use page setup. There you can size it and print from there. This is about as easy as it gets. Works for me every time.
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iphoto 4 prints 4x6 images as 4x5.25 instead.
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