Comment 52 for bug 1119420

w-sky (w-sky) wrote :

13.04 is obsolte soon, but there is the same problem with 13.10, and as officially it is not a bug, but a so-called feature (or rather a totally wrong decision by Canonical), it can be resolved with a custom PPA that changes the panel to enable whitelisting again.

More info on this here: http://askubuntu.com/questions/362135/how-to-re-enable-tray-icons-for-applications-in-ubuntu-13-10/