Stepping out of method while debugging stops program

Steps to reproduce the behaviour using attached project:

• Set breakpoint in main.cpp line 7
• Run program in debug mode
• Press F11 to walk into method call
• Press Shift-F11 to leave method call

The debugger does not end up in main method but the program is stopped.

I am working with the following environment:

• Windows XP Professional Version 2002 SP 3
• Visual Studio 2003 Version 7.1.6030
• Microsoft Debugging Tools for Windows Version 6.11.1.404
• Qt Creator 1.3.0 Beta (alias 1.2.92)
• Qt 4.5.2 LGPL (self compiled)