Part of Update 10 (released January 3, 2017) was an update to the Glyphicon library which resulted in a few icon class changes. Below is a list of all of the classes that were affected.

Old Class	Current Class	Set
souncloud	soundcloud	Social
hotspot	paired	Basic
airplane	plane	Basic
bed	bed-alt	Basic
bed-alt	bed	Basic
remove-2	remove	Basic
remove	remove-circle	Basic
ok	ok-circle	Basic
ok-2	ok	Basic
circle-remove	remove-sign	Basic
circle-plus	plus-sign	Basic
circle-minus	minus-sign	Basic
circle-ok	ok-sign	Basic
circle-question-mark	question-sign	Basic
circle-info	info-sign	Basic
circle-exclamation-mark	exclamation-sign	Basic
ban	ban-circle	Basic
google-maps	map-marker	Basic
left-arrow	arrow-left	Basic
right-arrow	arrow-right	Basic
down-arrow	arrow-down	Basic
up-arrow	arrow-up	Basic
ruller	ruler	Basic
paragraph	paragraph-alt	Basic
note	music-alt	Basic
mosquito-net	mosquito	Basic