icons not shwoing on buttons in the agenda

Icons are not showing on the buttons at the top of the agenda. please see attached.
Tried in IE 11 and Chrome Version 73.0.3683.86 (Official Build) (32-bit) on Windows 10.
I have never seen the icons displayed in the past few years.

I'd really appreciate your help. Thank you so much!

Somehow you are managing to block the loading of the FontAwesome web font that we use for the icons.

This is an issue on your end... you must allow the use of web fonts. You likely have a browser setting somewhere that was changed from the default.