Simulation (internal) of a simple state machine fails

[Spool]

I have designed a simple endless running state machine into two diagrams. Unfortunately, the internal simulation ends without any understandable reasons at different points, regarding of its start value (Val=1 or Val=0) and by random. Sometimes it works a full cycle, so it can't be totally wrong.



Any hints? Any ideas?

Update:

It works perfectly, if I don't use the state machine element. The elements and the diagram are only moved, so there is no hidden error in it.



I don't want to do without it because I want to make use of executable state machines later on.

Thilo