Description of problem:
KDE Desktop fails to load icons

Version-Release number of selected component (if applicable):
4.12.5

How reproducible:
Not every time but very often

Steps to Reproduce:
1. Select folder view in desktop settings, and use custom background (slideshow)
2. Log out or reboot
3.

Actual results:
The desktop is empty and shows default background. Something that looks like a  slider occurs on the side of the desktop under the "peanut" icon but it does not do anythng. Selecting another desktop layout (such as standard layout) and back again restores the desktop.

Expected results:
Expected to keep desktop settings between sessions.

Additional info:
My setup uses two monitors and an Nvidia card, but not the proprietary drivers.
This problem is reported as bug 1051692 which was closed as an nvidia proprietary driver problem.