Thanks Dodger, I went throught the file and zeroed all the initValues (and having missread your advice) the staticValues, that seemed to fix it. I will also set the "static" to zero, now my eyes are working straight. What is the relation between initValue and staticValue? It seems like one sets the other but I never worked out which way the controls flowes, I am guessing that "static" is a switch to either lock one of these peramiters, or to lock the update from one to the other.