I'm using Linux Mint 16 Petra with the MATE desktop environment.

Perhaps I shouldn't have done this, but when I was adding a new application to my list of startup applications, I saw what seemed like duplicate entries, and so I removed the duplicates.

After a reboot, the notification area in my panel is now displaying incorrectly, with some icons being duplicated, and others, like my sound and network icons, not displaying at all. Here is what it looks like:

![broken notification area](https://i.stack.imgur.com/FWIQT.png)

I have tried uninstalling and reinstalling the `Notification Area 1.6.1` applet, and manually adding applets like my sound applet, but without any impact.

How do I get my notification area back to normal?