I have this problem too. I think it is caused somehow by the MD-11.Reloading a saved a flight which is allready loaded (hope you know what I mean CTRL + ?) leads very often to a completly screwed up MD-11 panel and sometimes an FS crash. This crash doesn't have an impact on the MD-11 but, and this is the described problem, leads to the getting stuck and crash upon loading the 737. After the MD-11 problem only reinstalling the 737, and with this the 747 and MD-11, cures this problem.And to confirm, it is the 737 initiliasation and the AIRAC loading wich does get stuck and then causes the FS9 to crash.