I created a .css file from http://themebuilder.telerik.com/aspnet-mvc based on Bootstrap 4. When I downloaded it, I noticed that the 'WebComponentsIcons' WOFF is now embedded as base64. GREAT!
However, often when I refresh my browser (F5), the sort, filter, paging icons do not render properly and give me ugly ASCII chars (please see attached).
Telerik UI for ASP.NET MVC R1 2018 (2018.1.221)
Internet Explorer 11.0.9600.18861