If your Preview or Textedit apps are crashing on your new Mac Lion, do not worry. The problem lies with your Root permissions.
Here is a quick fix:
1. Click on Finder, and hold the Option key, and select Library
2. Click on Get Info
3. Now, on Sharing and Permission, click on the + sign, and add your User Name, with Read & Write permission. If the + sign is unavailable, click on the lock on the right and type your password.
This is it. If you have any questions, please use to comments below.