gparted, it crashes with the error:
Gtk-ERROR **: GTK+ 2.x symbols detected. Using GTK+ 2.x and GTK+ 3 in the same process is not supported
I already opened LP bug #1094354 for this.
Searching the internet for this error, I see that almost every Linux distribution suffers from the same issue regarding this GTK+ 2.x/GTK+3 error for various other GTK-based programs too, e.g. gedit, gwibber, canberra-gtk, etc...
The GTK developers are claiming that it's not a GTK bug. Yet, no one on all the sites I've Googled has come up with an answer as to what this error message actually means.
What is going on in a program to cause this error? And what does this error mean in detail?