Fast Shader goes bright and flat problem

Hi,yeah its been doing this for a while,just appears to change to a brighter non specular texture with hardly any contrast.I think its me clicking something switching between tablet and mouse:/.It still has a default fast shader applied,if I draw out a test sphere its fine.Up till now I was just clearing the layer and redrawing the Ztool,but now it seems to have saved the tool with this flat setting.I've clicked around for ages ,any ideas? Thanks for your help.

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