I'm using Ubuntu 12.04 with Gnome classic. Pidgin's tray icon doesn't show up. The settings is ok ("Always").
For any case, I've also added it in dconf-editor as per How to enable notification area (systray) for Pidgin although that's probably only for unity.
Also I've reinstalled and restarted Pidgin. But still no success - no trayicon anywhere.
I wanted to check whether I have the taskbar in the UI, but I have no idea how to set up panels in Gnome classic. Right-click on panel doesn't work.