Tried all possible ways to give visibility to tray icons in Ubuntu 12.04 but no luck :(
Please note that only some tray icons are invisible. I still cant see pidgin, davmail, guake tray icons. I am on Ubuntu 12.04 Gnome classic mode (gnome-session-fallback).
The solution is to add the Notification Area applet.
Taken from this question No Banshee notification area icon in Gnome 3 classic session
I have just solved this problem with davMail on xubuntu using the following method:-
sudo apt-get install libswt-gtk
It took me along time to find the solution, but it is quick and simple to do.
Have you added the indicator applets to your panel? This might help: I can't add a Indicator Applet to Panel in Gnome-Classic
I just installed Eclipse, but I got a problem, after I minimize the Eclipse than it's not visible on system tray. I also check the ALT+Tab but there also isn't visible. I had to kill the process and restart. How can I fix this?
It spreads all the windows in current workspace.
You dont have to kill the application
Finally I figure it out:
I removed the eclipse:
sudo apt-get --purge remove eclipse
sudo apt-get autoclean
I installed again:
sudo apt-get install eclipse
And it's working now. I have no idea why didn't work before, case I have deleted the old ubuntu(10.04) and I installed the 12.04 from scratch.