So I was working as normal on a project of mine, when suddenly zbrush decides to only display a flat shader for everything.  I don't believe I lost any of my textures or polypaint data, it just won't display anything but a flat shader on my tools.  This is the first time I've encountered a problem like this.  Any idea what's going on?  I can't change the matcap at all.  If I choose a different matcap nothing really happens.  This is really frustrating.
                    
                 
            
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Are you on R3?