ZBrushCentral

Cant see Ztool

After exporting my diffuse maps out of Zbrush last night I tried open the tool today and cant see it. I know its there because when I start painting in the document it appears. What can I do I need to export the normals and disp maps and cant do anything?

Please help

Thank You

could it be that you need to flip the normals? Just a guess