Since updating the Qt version to 5.5.0, I have had reports of Glade failing with messages like:
QXcbIntegration: Cannot create platform OpenGL context, neither GLX nor EGL are enabled
Segmentation fault (core dumped)
The problem is that in 5.5, Qt moved to using xcb and for OpenGL, an undocumented Qt plugin was needed (thanks Qt!)
In 4.4.62 this plugin is now shipped… Note that this only affects Linux and not Windows or OSX.