Fedora 22/Gnome 3.16: Notification pane with "meta"-"m" key sequence doesn't show the runnig skype/dropbox icons

On Fedora 21 by pressing <meta>-<m>, I got a small pane on the bottom where the notifications
appeared and e.g skype and dropbox, which are running in the background.

On Fedora 22, the notification moved to the calendar display, but the icons for skype and dropbox are
not visible there.

I found a hint on the lower left corner of the screen.

by pressing on the arrow you get a pane coming in with the icons: