Any hints whats wrong?
How about a hint about what you mean by "does not work"
Unless they have changed their PC board those are the correct parameters for lcd.begin(). The sketch is also fairly standard except for the extra (and unneeded) lcd.setCursor step in setup().
Are you using an Arduino Yun or Due?
If not then why are you using 'beta' software?
If you are then did you check to see if the shield is compatible?
Did you see this on the Arduino download page?
WARNING: The early Windows release 1.5.4 contained a bug that prevents it from working correctly on Windows 8. 1.5.4r2 fixes the issue.
Of course they didn't specify how the bug manifests itself.
Don