I emailed Tim Cook about this issue and my email got passed on to Executive Relations, where a guy named Tajai made an attempt to call me at my house (was never home when he called) the past three days, and I called him back today.
After talking with him briefly, then being passed on to Ed from Support, the fix that did the trick for me was the following:
Shut the computer down.
Start it while holding the Option key.
Select the Recovery HD.
Open Terminal from the Utilities menu in the top.
Type in "resetpassword".
Select your account and change your password.
Go to the bottom and select Reset where it says something about Permissions (forget what exactly it says).
Make sure your account was still selected.
After that, go to the top left and select Restart under the Apple menu.
Let it restart as normal, and log in with the new password.
You may have some issues with keychain asking for your password and your new one isn't working. If this happens (it did to me), click cancel and let your desktop load. Then go to your Library<Keychains folder and drag the login.keychain file onto your desktop.
Restart the computer again.
Log in.
See if TextEdit and Preview works!
I'm almost positive these were all the steps, so hopefully they make sense and work for you anyone who tries it.