Max Particle in Trail Bug?

It can be easily reproduced.

  1. Create a new particle system

  2. Add the Ribbon Data Type

  3. Set Max Particle in Trail Count in the Ribbon module to 10000000 or more (on my computer, it is enough to lower the FPS to 1)

  4. Put it on an empty level

So, a new particle system have default emitter duration is set to 1 second, and default spawn rate to 20. This means that in one second will be spawn 20 particles and then the emitter will start again. Default particles lifetime is 1 second too. Thus in fact, we have no more than 20 particles at any one time.