When TextBox with set MaxLength property has an EmptyMessage longer than MaxLength the form is not submitted in IE11. Steps to reproduce: 1. Run the following code in IE11: <telerik:RadTextBox runat="server" ID="txbRelatedMessageVersion" Width="200px" MaxLength="10" EmptyMessage="Message Version" /> <telerik:RadButton ID="amendBtn" runat="server" Text="Submit Page /> 2. Click inside RadTextBox 3. Click the button Result: the empty message is considered as a not valid value and the page is not submitted. Changing the MaxLenght to 15 will allow to submit the page successfully.