So is Infragistics 5.3.20053.50 compatible in IE 11 ? 

I was actually able to get the controls loaded in the compatibility mode in IE, but when I remove the compatibility mode the error re appears. We have the same version working fine in our prod environment I am not sure why it would do that in the  test environment. 

It is referencing version 5.2 . This is the header from the aspx page

<%@ Register TagPrefix="iglbar" Namespace="Infragistics.WebUI.UltraWebListbar" Assembly="Infragistics.WebUI.UltraWebListbar.v5.3, Version=5.3.20053.50, Culture=neutral, PublicKeyToken=7dd5c3163f2cd0cb" %>

 The version 6.2 is not in the project's bin folder and after uninstalling 6.2 I do not have anything left in the GAC besides the dll in the Temporary ASP.NET Files.