I would like to ask you to carefully check the references to all Telerik controls in your project and make sure that they are the same version considering the suffix as well (.20 or .40). Better yet, you can remove all references and add them anew by using the DLLs from your installation. Delete the license.licx file. After that, you should rebuild your project, close Visual Studio and open it again to make sure that no references are kept in the memory by Visual Studio.
However, if you are still experiencing any further difficulties, I would kindly ask you submit a support ticket from your account and provide a sample project demonstrating the undesired behavior that you are facing. Thus, our support staff would be able to investigate the precise case and provide further assistance. Thank you in advance.
I hope this information helps.
Dess | Tech Support Engineer, Sr.
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