I have had the same problem. First the left side cracked when the hinge froze up. I replaced both hinges as it was getting harder and harder to open the computer without cracking the rest of the case. I finally replaced both hinges but it lasted about a month before the right side cracked. Now if I want to use the computer i have to prop the screen up carefully because it is now detached from the rest of the case. I think it was a bad design to have the hinges so close to the edge of the case and Acer should be responsible. I have two other 17 inch computers and never had a problem with the case cracking.
