Given that the references point to the correct assemblies (all of them should have the same version) it is hard to define the source of the problem without your solution, but using just a screenshot you sent.Could you, please, provide us with your solution or with a small sample solution which reproduces it?
As a side note, in the Q2 2013 release we've introduced new visualization engine in the RadMap. It has been designed from scratch to have better performance. The new engine is based on the VisualizationLayer class. Even the visualization layer has few good known lacks in the functionality (we are working on them actively) I would recommend you to give it a try.
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