Particle Start Delay Error in 5.3.1P1

I updated 5.3.1P1,
I am very happy Invalid AABB result of problem fixes
However, I encountered an other problem, when the value of my Particle System Start Delay is greater than 0,
I Set Activate = false, again Set Activate = true, the Particle System will not be displayed.
Why is this?

maybe it is the same issue as we have here:
forum post

I think this is a bug,i went back to 5.2,do not know when repair.