Description of problem: Anaconda UI is flickering aggressively in some but not all parts of the UI; flickers continuously during installation, and in custom partitioning. See attached movie.

a.) This is a recent problem, it wasn't happening with any of the builds prior to about two weeks ago (maybe none prior to the most recent mass rebuild but I'm not certain of this).
b.) It doesn't happen with any other applications in either the Live environment or post install.
c.) This has only been tested in VirtualBox on OS X, but as it's happening in the live environment, there are no vbox specific kernel modules built so the kernel isn't tainted.
d.) I'm not certain this isn't a gnome-shell problem, except for the fact no other applications exhibit this behavior.


Version-Release number of selected component (if applicable):
anaconda-21.48.2-1.fc21.x86_64
gnome-shell-3.13.90-1.fc21.x86_64
xorg-x11-server-common-1.16.0-1.fc21.x86_64


How reproducible:
Always

Steps to Reproduce:
1. Launch the installer and start using it.


Actual results:
Screen starts to flicker. When slowing down the screen capture, it's actually anaconda itself flickering, and revealing the gnome-shell background which is not flickering, nor do any other applications that happen to be running behind anaconda.

Expected results:

Not this.

Additional info:
Will attach screen capture and some logs.