Strange NullReferenceException

Hi,

I am writing a program, running on many different machines. The program uses a control that is derived from GLControl. In a few of machines which program runs on them, OpenTK raises a NullReferenceException. I believe this exception is machine dependent, because the code works fine on the machines exact same condition.

The buggy code is located in the constructor of the form. I read a thread here and tried to solve the problem with:

            dummyGraphics = OpenTK.Graphics.GraphicsContext.CreateDummyContext();
            OpenTK.Graphics.OpenGL.GL.LoadAll();

but now CreateDummyContext raises the exception. My version of OpenTK is 1.0.0.201.

How should I solve this problem?

Thank you in advance for your help