Yes, i fixed all the bugs and verified all presets for making "seamless loops". The bug was, that the particles behaved "indeterministic". Their movement and size was not reset with parent emitter. If you think that i spend more time with making the "goodies", you are wrong. That are perhaps 10% of the time i spend on the interface, the engine, the functions and the help files. Believe me, it's not that trivial to get a stable multiprocessor engine, or why do so few apps have support for multiple CPU's?