I have an application that was working fine with Creator 3.x.x and Qt 5.4.x. Now I opened and recompiled the project in Qt Creator 4.2.0 and Qt 5.6.2 MinGW. Now I see:
If I start debugging, Creator displays an error message saying "During startup program exited with code 0xc0000139".
I don't see even the first qDebug message:
I've seen the same issue in another project. However after restarting Creator it's gone. This time even if I restart Creator, I still see the issue.
If I create a deployment directory with all the Qt libraries and platforms/qwindows.dll and copy the app there, it works fine from that directory.
I use a custom MinGW 4.9.3 installed in PATH (see screenshots)