V2014.4.1411 URL: http://www.ajaxcontroltoolkit.com/CascadingDropDown/CascadingDropDown.aspx Record a test in IE 11 using options Audi, S4, Metallic. When selecting the final option, Metallic, I get an error as show in screenshot attached. "Microsoft Visual C++ Runtime Library. Works fine in FF 32 and Chrome 40. Log attached. Message from error dialog below. --------------------------- Microsoft Visual C++ Runtime Library --------------------------- This application has requested the Runtime to terminate it in an unusual way. Please contact the application's support team for more information. --------------------------- OK ---------------------------