I am useing twitter bootstrap 3.2.0 and I use some glyphicons they work properly in ff, chrome, and opera but they are not displayed within the Internet Explorer.
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Load the bootstrap.css from CDN instead of the resources folder in the application. It worked for me after loading from CDN.
Check-in networks tab what are the files which are using the glyphicon-screenshot or icons which are not loading. in my case, it is "glyphicon-screenshot" not loading in IE 11 browser.
Before that check, the font(s) are enabled
and Icon(s) which are not loaded will show error in styles tab f12 debug tool.