[Qt-creator] Cannot display QML inside creator, works just fine outside it

[Nikos Chantziaras]

When I run an application that displays a QQuickWidget outside of 
Creator, everything is fine. However, when running it in Creator (with 
or without debugger), the application freezes at the moment the 
QQuickWidget is used, and I get this error in "Application Output":

   Unrecognized OpenGL version
   Unrecognized OpenGL version

What is wrong here?

I'm on Linux 64-bit, with Qt Creator 3.6.0.