What exactly do you mean by "at the same time"? Had 2 groups of 4 solving the puzzle and completed the 2nd line of each pylon within seconds of each other. Still bugged out. Do we need to alternate each console use between the 2 pylons?
The colors are on a set circle. Yellow-White-Purple-Red-Green-Blue. You have to complete both pillars at the same time (or as close as you can).