The version mentioned have been released before the existence of IE11, and thus, it is not officially supported under a browser that have not been available for testing.
With the latest version, I am unable to reproduce such a behavior. You can test with this online demo—http://demos.telerik.com/aspnet-ajax/editor/examples/overview/defaultcs.aspx
. Therefore, it is best to upgrade the UI for ASP.NET suite in order to resolve this issue.
Do you want to have your say when we set our development plans?
Do you want to know when a feature you care about is added or when a bug fixed?
Telerik Feedback Portal
and vote to affect the priority of the items