When a curve guide animates, it doesn't correctly work on dynamic particles. This because the guides work on a fixed starting position (the birth of particle) and then defines a full path for the entire particle. It is clear this was only coded with static particles in mind... Nevertheless, I've added a line of code to at least put the curve guide on correct location for the moment a particle gets born. Report moved to the todo tracker; this should be a spec for particle recode