I have just fitted a Cortex in a new model with Powerbox expander and there seems to be a problem. All the control surfaces that are going through the Cortex are jittering slightly. I have read about the software update on early versions to solve this but this one is only a or so week old and Im assuming it has the latest software.. Not sure if it makes any difference but the Expander is set to 15ms.

Anyone got any ideas on how to sort it?

thanks
Jason