Further information: I tried starting it in terminal and here is the read out:

DI2014-RC:~$ dde-control-center
==> [info] Language: en_US
==> [info] initTrayIcon emit
QSGContext::initialize: stencil buffer support missing, expect rendering errors
QOpenGLShader: could not create shader
QOpenGLShaderProgram: could not create shader program
QOpenGLShader: could not create shader
QOpenGLShaderProgram::uniformLocation( imageTexture ): shader program is not linked
QOpenGLShaderProgram::uniformLocation( imageTexture ): shader program is not linked
QOpenGLShaderProgram: could not create shader program
QOpenGLShader: could not create shader
Renderer failed shader compilation:
""
Segmentation fault

Cheers
Platypus

Please uninstall the Nvidia drive, because it will cause failure to  QT5 program.

That's not entirely true.

With the nvidia drivers from Ubuntu's repositories, the right-click context menu won't display, and the control center ("dde-control-center") won't display either.

However, if one blacklists the nouveau driver and installs the stock nvidia driver, downloaded from Nvidia's website, it works fine (I also have to create a custom xorg.conf in order to get the correct screen resolution). So the problem is with Ubuntu's packaged nvidia drivers.

I am not a programmer, but this seems to be a known bug with PyQt vs. Ubuntu's modifications to the nvidia driver. For example, see this bug report on Launchpad.

Thanks for your comment. Ubuntu uses different technology from us, we use QT5, so this problem occurred.