The trajectories now always have default colors instead of user defined in A01Trajectory.cc. It worked in 4.5.2 - 4.5.2.p02. I tried with OpenGL using opengl.mac.
A01Trajectory is no longer being used. Trajectory is instead coming from G4Trajectory which has the advantage of including HepRep attributes. To make A01Trajectory be the class that is used, change G4Trajectory to A01Trajectory in A01EventAction.