Ever since I updated to 10.11, all the share items disappeard, the share menu in finder (or anywhere else, i.e. Preview.app) is either empty or freezes the app upon click. Also extensions disappeard from the System Preferences.app (the list is empty).
Along with that (although it might be a completely unrelated issue), today widgets dispapeard: only Today & Tomorrow widgets are available.
Has anyone experienced this issue?