A method of solving QT debug always segmentation fault

The last two days with QT programming, as long as a debug, always appear this problem, it is annoying:

At first I was wrong about my machine, thinking that Mac Air bootcamp win7 is a bug, until you see this page: http://lazarus.freepascal.org/index.php?topic=6225.30

By the inside a paragraph of Chinese hints, I put Comodo firewall off, the problem immediately resolved, can be normal debug.

Firewall this thing, really nothing to do you a AH.

9.18 update: After shutting down the firewall, still not every time can be successful, the approximate rate of this error will still appear, but try a few times better.