After Version 1.6.4 crashed X-Plane 11.52 I reinstalled Version 1.6.3 yesterday, but it crashed XP too. Afterwards I updated XP to Version 11.53. This morning I started XP first with the default C172, then I loaded the SAAB 340. Everything went well until I reached the holding point at RWY 24 EGPH. There the aircraft stopped and didn't move further on. I openend the licencing tool, which made XP 11.53 crash again.