Light Sensitivity - going wrong

[Neil Cooke]

Hi List,   What am I doing wrong please ....   1. create sphere - analytic.   2. create light point   3. drop LightSensitivity material from the library into the light point.   4. adjust sphere properties .... color/set surface properties attribute to light sensitivity and change the value from 0.000 to 1.000   5. Ray trace ... no change (as compared to a control set also created but not mentioned above.)   6. Re-open properties for sphere and find the light sensitivity option in surface attributes has been re-set to color.   ..... so, not only no change but the values are being over-written.   ???   Thanks   Neil Cooke