By the way, I made just a test, I edit "setcolor.fx" this line:
gl_FragColor = vec4(red * a, green * a, blue * a, a)
gl_FragColor = vec4((100*(red * a)/255), (100*(green * a)/255), (100*(blue * a)/255), a);
.. It works when you open construct.. but when i run it to a browser i get bug warning.
Where is the problem you think, what need to fix?
Thanks again for your help!