Won't close - Need to always force close

[gphidenori]

I have saw the log you send. It says nothing just you start the fab with no worked. Does It happend every time or sometimes? I can not reproduce in my mac.
Are you choosed Minimize to systray in closed window?

At this time I choosed "quit" and select quit app.

Now I picked up again logs.
(log and zipped)
At this time beta ver. has no hang(but this time I change no preference and anymore).
Latest ver. has hang again.