I reported another bug and was asked to compile and install debug version of qt creator to get backtrace. I downloaded qt creator 2.7.1 from here http://download.qt-project.org/official_releases/qtcreator/2.7/2.7.1/qt-creator-2.7.1-src.zip, unzipped it, opened .pro file, chose built-in mingw32 with qt (shipped with qt creator) and after printing some lines in "General Messages" console it hung. I tried it multiple times, it hangs every time.