I recently took my 5-month old Macbook to the Apple store to get the topcase replaced, since I was having the usual issue of cracking on the palmrests. It was no big deal, and I didn't care since I know this happens a lot, and they fixed it very quickly with no questions asked. However, soon as I got home I noticed a new crack, not on the topcase but in the actual, hard-plastic part of the bottom case itself - and since I'd recently been peeking down there a lot investigating the original cracks, I was fairly certain that it hadn't been there before. It's thin and doesn't appear to deep, but runs a good 2 1/2" under the front edge. I figured it happened somehow during the installation of my new palm rest, so I took to back to the Apple store. They were once again really nice and are replacing the case for me, since it could worsen over time, but also said that it most likely didn't happen during the installation, and that it had been there all along. Thing is, I'm pretty certain it wasn't there before. Plus, I'm not even sure how the original cracks got there to begin with, since I'm one of those people who babies their computer and gets upset when it gets hit by a slight breeze. I've never slammed my lid closed, since I read about the cracking before I first got it, and the computer rarely makes it out of my house. So, would you guys say it's normal for the hard plastics on the Macbook to crack so easily like that? Have you noticed this before too, and should I expect it to happen again? Here's a picture of what I'm talking about. It's kind of hard to see with the camera I was using, but it's the faint line in the front just beneath the edge of the palmrest: http://www.flickr.com/photos/28156514@N05/2628881605/in/photostream/ http://www.flickr.com/photos/28156514@N05/2628881735/in/photostream/ Thanks in advance! Sorry if this has already been talked about, but all I found in my searches were chats about the regular palmrest cracks.