I previously owned a Epson Cinema 550 which allowed you to adjust the keystone. After 3.5 years it quit on me with the message "Epson Cinema error" and the estimate to fix it made me decide to buy a new one and get a long extended warranty this time. So I bought the HC6100 and as far as the picture quality goes it is exceptionally good but the picture is out of square. This is really annoying when a picture isn't completely filling up the screen because it is easy to see the picture isn't square or when using the test pattern and it is not caused my screen either. Because the 6100 doesn't have a manual adjustment for this problem there appears to be no other solution other then return it. My concern is that after I go to all the trouble of swapping it out for another one I may find out this is not all that uncommon with the 6100. Needless to say the oversight or intentionally leaving off a Keystone Adjustment was stupid on Epson's part because a little tweaking would have fixed this problem. I was wondering if anyone else has had this problem or most likely won't repeat itself if I swap it out.