Hey LordFriteuse-
Can you test creating a new project with Starter Content and let me know if you have the same crash when modifying one of the particle systems included ( for example). If this does crash for you, please add the callstack and log files from the crash for additional information. If you do not get a crash, please include the callstack/logs from your project that is crashing along with a copy of the particle system that causes the crash along with the steps taken to setup the particle system.