Element 2 was running DMX Outputs at Maximum Speed. [Displays] >Setup, System. Changed to Medium and switched RDM Off to solve a flicker problem in a Studio Rig of IES IGBT Dimmers. Suspect they could not cope with refresh rate. This had all the characteristics of a classic DMX flicker. The 2003 install had various other issues which may have been a contributing factor. It now has a new cable rig and several DMX buffered & terminated cable runs.