Comment # 18 on bug 953954 from Yuan Shuguang

I've installed "alltray" to have a system tray in task bar for several of my
program. It works fine in all previous openSUSE, but it doesn't show any tray
in openSUSE Leap..... Meanwhile, I also noticed that dropbox tray also gone.
The tray of Skype seems to be all right....

I am just wondering, how can we solve this problem?