I’m having the same problem. Lenovo, Win7. Klok was working fine until 30+ Windows updates were pushed out this week. Now, the loading screen sticks at “Initializing…50%”, and never loads. The same klok.db file works fine on a Windows 8 PC. I tried uninstalling and reinstalling both Klok and Air. Klok is a great app, and I depend on it every day at work.