Well seems like PB4 is the deal breaker for me. Here's a list of what's broken for me. With the public release not far off I guess I can live with it until then and do a full reinstall.
Dark Mode will not switch back to Normal Mode. Box gets unchecked but will still be in Dark Mode. Restarting results in Dark Mode box being checked.
Serial Number under About my Mac is now showing unavailable.
Can't login to iMessage or Facetime. Getting the error message "Unable to login. Please check your internet connection."
What did you do to your system ?
1. Dark Mode works just fine.
2. Serial Number is showing
3. FaceTime works as well