Zbrush Materials preview no longer showing in Lightbox or Tools

Sardu

Hey everyone. Quick problem looking to get solved. I'm in the middle of a Zbrush project and suddenly none of my material previews are showing in lightbox or in the Toolbar. They show on the sculpt fine, the tooltip shows a preview of the material on the sculpt in lightbox, but they don't show on the orbs. 

The problem fixes itself when I start a new project so I'm not sure if I hit something accidentally. 

Thanks in advance! 

Edit: Using 4R7. Sample image below.

http://i.imgur.com/64CPKxd.png

Sardu

FIXED. 

I had my damn light turned off.