Although Equation Editor is a great application, there are a few very nasty "features":
1. If you add an equation to a library, you cannot update it. You have to add the equation again and delete the old one.
2. If you click on an equation in the library, your current edited stuff in the window is gone (no undo)
3. If you do a right-click on an equation in the library, it is deleted and gone (no undo)
4. Before you quit, you have to explicitly save the library. And equation editor will _not_ ask you if you want to save your library. It does _not_ automatically save anything. If you just quit, all your equations will be gone.

Latex Equation Editor is already a useful tool. By getting some of the basic usability right, it would be outstanding. I'm just hoping for an update.