Hi Paul,
Using different versions of the Telerik DLLs in one and the same project is highly not recommended scenario that usually leads to many errors. The main reason behind this requirement is that we are introducing many new features (and updating others) in each release, which are expecting specific resources from the Telerik.Web.UI.Skins dll.
I would advice that you upgrade your project with one and the same version of all Telerik DLLs and see whether the issue will persist.
Regards,
Vessy
Telerik
Using different versions of the Telerik DLLs in one and the same project is highly not recommended scenario that usually leads to many errors. The main reason behind this requirement is that we are introducing many new features (and updating others) in each release, which are expecting specific resources from the Telerik.Web.UI.Skins dll.
I would advice that you upgrade your project with one and the same version of all Telerik DLLs and see whether the issue will persist.
Regards,
Vessy
Telerik
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