title: QNetworkAccessManager crashes on get
body: <p>QNetworkAccessManager worked just fine, then began to crash every time on get() method which is very simple:</p>
  
  <pre><code>QNetworkReply *reply = myManager-&gt;get(QNetworkRequest(QUrl(myUrl)));
  </code></pre>
  
  <p>Stack is the following:</p>
  
  <pre>
  
      0   RtlpAllocateHeap    ntdll       0x77a93364  
      1   RtlAllocateHeap ntdll       0x77a93074  
      2   RtlDebugAllocateHeap    ntdll       0x77b310d3  
      3   RtlpAllocateHeap    ntdll       0x77aeb16e  
      4   RtlAllocateHeap ntdll       0x77a93074  
      5   _heap_alloc_base    MSVCR100D       0x53be8343  
      6   _nh_malloc_dbg  MSVCR100D       0x53bf697c  
      7   _nh_malloc_dbg  MSVCR100D       0x53bf671f  
      8   _nh_malloc_dbg  MSVCR100D       0x53bf66cc  
      9   malloc  MSVCR100D       0x53bf9c5b  
      10  operator new    MSVCR100D       0x53be7db1  
      11  QByteArrayMatcher::~QByteArrayMatcher   QtCored4        0x53cecbff  
      12  QByteArrayMatcher::~QByteArrayMatcher   QtCored4        0x53efa480  
      13  QByteArrayMatcher::~QByteArrayMatcher   QtCored4        0x53dbc736  
      14  QByteArrayMatcher::~QByteArrayMatcher   QtCored4        0x53db97d1  
      15  QByteArrayMatcher::~QByteArrayMatcher   QtCored4        0x53db9d26  
      16  QByteArrayMatcher::~QByteArrayMatcher   QtCored4        0x53e0ea8b  
      17  QByteArrayMatcher::~QByteArrayMatcher   QtCored4        0x53e2417c  
      18  QByteArrayMatcher::~QByteArrayMatcher   QtCored4        0x53db8d02  
      19  QByteArrayMatcher::~QByteArrayMatcher   QtCored4        0x53db9f4d  
      20  QByteArrayMatcher::~QByteArrayMatcher   QtCored4        0x53e2c690  
      21  QByteArrayMatcher::~QByteArrayMatcher   QtCored4        0x53e2d020  
      22  QByteArrayMatcher::~QByteArrayMatcher   QtCored4        0x53e2c13b  
      23  QNetworkProxy::setPassword  QtNetworkd4     0x536593e3  
      24  QNetworkProxy::setPassword  QtNetworkd4     0x53658a58  
      25  QNetworkProxy::setPassword  QtNetworkd4     0x53656eb4  
      26  QNetworkProxy::setPassword  QtNetworkd4     0x5365359e  
      27  QNetworkProxy::setPassword  QtNetworkd4     0x536534b8  
      28  QNetworkProxy::setPassword  QtNetworkd4     0x536537ea  
      29  QNetworkProxy::setPassword  QtNetworkd4     0x5360c06f  
      30  QNetworkProxy::setPassword  QtNetworkd4     0x5360b2ec  
      31  get command here    myfile.cpp  73  0x552b9123  
      32  main    main.cpp    409 0x13aca9    
      33  WinMain qtmain_win.cpp  131 0xa0e55a    
      34  __tmainCRTStartup   crtexe.c    547 0xa0d7d0    
      35  WinMainCRTStartup   crtexe.c    371 0xa0d55f    
      36  BaseThreadInitThunk kernel32        0x75f9336a  
      37  __RtlUserThreadStart    ntdll       0x77a992b2  
      38  _RtlUserThreadStart ntdll       0x77a99285  
  
  </pre>
  
  <p>P.S. Now sometimes start to crash in this line:</p>
  
  <pre><code>QList&lt;QNetworkInterface&gt; interfaces = QNetworkInterface::allInterfaces();
  </code></pre>
  
  <p>Other team members run this code without a problem from other PCs and places of course. What the reason could be?! Network issue, antivirus, firewall (tried to switch both off with no luck) etc?! Why it calls QNetworkProxy::setPassword?! I have no proxy, tried to set <code>NoProxy</code> explicitly as well with no luck. What the problem could be? Any ideas?</p>