I'm running fedora 25 with gnome.
GNOME doesn't have a Tray icon area.
Instead it has the notification area. Which can be a bar on the bottom of the screen or one that slides in and out (bottomleft), depending on your settings.
download this gnome extention: TopIcons or TopIcons plus
which you can find here (use the firefox with the gnome-extention enabled)
https://extensions.gnome.org/extension/1031/topicons/
this extention will put all icons that are in the tray/notification area onto the Topbar (left next to the power/sound/netwerk icons).
Also, I encountered a bug, that makes icons black or dissapear anywhere in Gnome (including inside the program Tixati, inkscape, banshee, etc).
this is due to a bug in the mesadriver (not sure). sollution for this is to rollback the mesapackages to a 12.0.x.x version
good luck.