Problems with Livecode 6.5.0 (Build 3009) Comunity Edition

If running the setup for Livecode or the program itself, it randomly hangs the system.

In the setup program, this seems to be triggered more often if one moves the mouse over any graphical element from the setup window, moving it, ect...
In the program itself it seems that it ocours entirely random. Sometimes it hangs instantly after start, sometimes it runs longer. It also doesn't always ocur at the same point. For example one time opening the config dialog triggers it, another time it does not.

OK, after leaving the system running a time, I noticed that it still outputs some debug messages from time to time and could still for example open the start menu. So it seems that it has not crashed, but slowed down very much.