gnome login display is constantly blinking

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Issue

Not able to login using graphical interface.
Getting a constantly blinking white box.
Getting a flashing login screen when when looking at the GUI and unable to login.
This occurred after updating the GTK2 package from GTK2-2.18.9-10.el6.x86_64 to GTK2-2.20.1-4.elx86_64

Environment

Red Hat Enterprise Linux 6.3

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