Navigation Panel Empty

My working navigation panel disappeared after an admin updated the server’s OS. I had to update update all the extensions just to make Xwiki work again, but for the life of me I cannot figure out what has gone wrong with the navigation panel.

2018-07-26%2011_13_17-Global%20Administration%20-%20XWiki

Are there any errors in the browser console?
If there has been an XWiki update, clearing the browser cache might help.