At the moment Magnolia AdminCentral is not compatible with IE11 over https

How to reproduce with IE11 on https://demo.magnolia-cms.com:

• Log in
• Open Pages App
• Edit a page (f.e. sportstation)
• reload the page
• watch the fonts and icons (which are part of MagnoliaIcons.woff) disappear

The trigger for this issue was a change in styles.css (for all fonts, not just MagnoliaIcons) done in MGNLUI-3983.

The reason for the issue is an IE bug with fonts over https, which apparently won't be fixed:
https://connect.microsoft.com/IE/feedbackdetail/view/992569/font-face-not-working-with-internet-explorer-and-http-header-pragma-no-cache

The only workaround at the moment is to remove the "pragma=no-cache" header from the response when loading WOFF files.