I had a code working on Qt 5.2.1 with msvc2012. When I passed to 5.4.2 with mscv 2013, it starts bugging.

My QOpenGLFrameBufferObject, even just after a call to bind, return false on isBound, but return true on isValid.
I use 4 QGLWidget, with depth and color buffer.

The following code is called in a subfunction of paintGL, so the context is on the widget.

pickingFbo = new QOpenGLFramebufferObject(width(), height(), QOpenGLFramebufferObject::CombinedDepthStencil, GL_TEXTURE_RECTANGLE);
pickingFbo->release();
qDebug() << "pickingFbo->bind()" << pickingFbo->bind() << pickingFbo->isBound() << pickingFbo->isValid();
//prints true false true.