Its Ethernet and win7 64 bit. My original image was a portrait 5x7" but I situated the photo as landscape in the PS print dialog since I was printing on an 8.5x11" so I could save the bottom half of the paper. I have a feeling the portrait layout is PS and then choosing landscape in the print dialog with the non-square 5760x1440 res setting is perhaps buggy. My thoughts were like yours at first as well, a defect in the printer, but I'm leaning toward software bug. I just installed the printer 2-3 weeks ago brand new. I'll try situate the photo in PS as landscape and then choose landscape again the print dialog and see if there are any issues.