When running MITK via VPN on my windows machine it crashes when it tries to render fibers.

To Reproduce:

1. Connect to a Windows machine via Remotedesktop
2. Start MITK
3. Drag and drop a fiber bundle into the application

->Crash

Assertion failed
Program: \VTK-src\Rendering\OpenGL\vtkShaderProgram2.cxx Line:419
Expression: "pre:context_is_set" && this->Context

Ignoring leads to a crash in
this->Context->IsCurrent()
as
this->Context
is NULL

Stacktrace is appended