If I use RenderTarget.DrawBitmap(), I can see the image and draw it on the chart - so the loading of the bitmap is not the problem.
For example, trying to create a bitmap brush and fill a rectangle with it using the following code will reproduce the error:
SharpDX.RectangleF rect = new SharpDX.Rectangle(0,0,50,50);
RenderTarget.FillRectangle(rect,bitmapBrush);
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