Bug 290628

Still happens on 4.8.0 (openSUSE packages). It seems to happen with all non-KDE4 applications (including Amarok 1.4).

Same here - 4.8.0 on Gentoo ~AMD64 - all non-KDE applications are missing from system tray. 
Impossible to access Skype, as it's running and there's no way how to open it's window. It's impossible to connect to WIFI networks, as wicd client is running and automatically minimized to tray.

Works for me when using skype, opera and xchat in KDE SC 4.8

Well, it also works on my 64-bit pc at work, but not on my 32-bit pc at home. The openSUSE software repositories are almost identical though.

(In reply to comment #2)
> Same here - 4.8.0 on Gentoo ~AMD64 - all non-KDE applications are missing
> from system tray. 
> Impossible to access Skype, as it's running and there's no way how to open
> it's window. It's impossible to connect to WIFI networks, as wicd client is
> running and automatically minimized to tray.

Problem was solved by rm'ing ~/.kde4 (remember kids, don't try this at home!)

I really don't think that removing ~/.kde4 can be considered as solving or even as a workaround.

PS. Issue still here in KDE 4.8.1.

same here with the update from 4.8.1 to 4.8.2 on Gentoo: all non-kde apps missing from tray.
removing ~/.kde4/share/config/{plasma*,kdesktop*} nullifies plasma config and "fixes" the problem.

and my KDE config directory spans from 4.0 and each version in-between. with all the outmoded, half-deprecated undocumented crap which accumulated inside KDE configs in that time, it's no wonder that something crazy, like this, happens.

I certainly don't want to delete the configuration files and doing it actually makes it impossible to debug the real issue.

So maybe anyone knows where is the system tray section in these config files? I grepped -i 'tray' from these files, but this did not turn out anything interesting.

Still happens with 4.9 RC1.

Confirmed by other user.

Happens with 4.9 final too.

I have had also this problem. The workaround is removing systray from panel and adding it again. In my case it helped.

I have tried it, but it doesn't fix it in my case.
BTW, I use KDE 4.9.3 currently and this behavior is still there :(

(In reply to comment #13)
> I have tried it, but it doesn't fix it in my case.
> BTW, I use KDE 4.9.3 currently and this behavior is still there :(

You are right. After restarting of KDE the problem returns :-(

Haha, what good joke this bug is :)

When I upgraded to 4.10 I started getting another notifications on the opposite corner of the screen. So that kind of made me wonder that maybe there is a duplicate and hidden panel somewhere. I opened up ~/.kde4/share/config/plasma-desktop-appletsrc file and looked for 'systemtray'. And indeed - there was a duplicate panel that had the size of my old  monitor's width - so maybe the old panel got duplicated when I changed my monitor?

The panel had identifier '[Containments][3]', so (while being logged out of KDE) I removed all the lines of that containment and when I logged into KDE again, and the duplicate notifications were gone. And now all the system tray icons are in the correct place again.

I hope our KDE "helpdesk" (aka users themselves) can learn something from that :)

i, personally, learned that KDE4 allows for hidden desktop elements, which cannot be removed by KDE's own means (since it lacks "remove" option in plasmoids list and a comprehensive active plasmoids list at all, unlike KDE3) and can seriously screw up one's desktop in non-obvious way.

and that is a bug of regression on its own. or a design decision and a "feature", depending on how you look.
let's hope, that someone else would report it, because it won't be me.

Yes, I agree. This issue could be taken as the one about hidden elements or better handling of all the different containers on the desktop.

But as for this certain bug - this was still not the case as it seems that the tray icons were there, but they were only on a hidden panel's system tray.

I can confirm this on KDE 4.11.00 (running on x86_64, Arch Linux).

My problem was exactly as described: non-kde applications that used the system tray were not appearing [in the system tray]

To identify which 'containments' to retain, I added a weather application on my left screen's panel, and a comic application on my right screen's panel, then dug in the plasma-dekstop-appletsrc file.

I found several 'containments' in there (1,14,28,29,30), of which 1 contained the weather app, and 30 contained the comic app.

After logging out of KDE, I removed 'containments' 14,28,30 from the plasma-dekstop-appletsrc, and logged back in.

It is a miracle! All the missing icons are back!

In my zeal, however, I note that I managed to delete the desktop background settings, but that was easily remedied.

Sorry I just noticed a 'bug' in my comment.

Please read 

"After logging out of KDE, I removed 'containments' 14,28,30 from the plasma-dekstop-appletsrc, and logged back in."

to be

After logging out of KDE, I removed 'containments' 14,28,29 from the plasma-dekstop-appletsrc, and logged back in.

I just got bit by this. Non-KDE tray icons missing. Everything was fine after an update, then system crashed, I rebooted, then the tray was messed up. Removing and readding it didn't help. As mentioned above, removing plasma-desktop-appletsrc brought them back to normal.

I'll attach my broken plasma-desktop-appletsrc in case someone wants to try to debug.

Created attachment 82817 [details]
~/.kde4/share/config/plasma-desktop-appletsrc file that seems to trigger bug