I use Ubuntu GNOME 15.04 with gnome 3.16, and I got the following error message in a small popup.
"Warning! System error detected. Would you like to report it?"
While everything was fine and dandy, no problem whatsoever. It's a relatively fresh install with nothing out of the ordinary installed.(essentially gparted, mscorefonts, atom and a few gnome extensions) I reflexively clicked it away so I'm not absolutely sure the wording is 100% exact, but I'm fairly certain. Nautilus, atom and Terminal (with no commands entered yet) were open again, and all functioned correctly.