Description of problem:
Gnome shell refuses to start when gtk3  is installed.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. install gtk3
2. try to start gnome-shell
When loading gdk-pixbuf-loader it complains that it cannot load version 2.0, because version 3.0 is already loaded (if you need the exact error I can reproduce it later).
Should start without issues.
After removing gtk3, it starts.
oops, sorry about the triple report... browser issues :(
*** This bug has been marked as a duplicate of bug 592534 ***