Hello Everyone.

This morning, I booted up my laptop and tried to connect to the school's wireless when I noticed that the icon for Network Manager was missing from the toolbar. I checked to see that Network Manager was running and it was, the icon had just disappeared for some reason. After tinkering around with the panel a little bit, I discovered that if you remove the notification area on the panel (right click the three vertical dots and click "Remove From Panel") and then re-add it ( right click the panel, click "Add to Panel" and search for "Notification Area", then click it) the Network Manager icon will reappear, thus allowing you to connect to wireless networks.

Hope this works if you're having the same problem!