I am not sure if this is a problem with the theme or if it is the distro. When
I loaded Screenlets, I right clicked on the tray icon and selected remove.
This caused all of my icons to disappear, including network manager and the
notification manager so I restarted hoping it would restart them but it did
not so I deleted them from the startup programs area and re-added them both
time restarting. Still nothing.
It's not a Mac4Lin issue. What you did was remove the Notification (tray)
applet. Just add it back again and you will get back all your icons.