I combined the * operator in the agent for modeling, but when I run the model, the operator will disappear on the model screen.
This is an internal divide by 0 error. We will get this fixed for the next bug fix release. It is caused based on several factors, the main one being that you have defined the queue as an A* barrier and yet the operators are getting into the inside of this barrier even though you've checked the Enforce A* Node Direction Limits box. When Enforce Limits is checked, the operator will only look in its immediate vicinity on each force update (i.e. the node direction limits immediately adjacent to the operator). Thus if the operator's max speed is such that it can traverse over multiple A* nodes between updates, then the operator will miss enforcing node limits, and will get into the barrier, and technically get stuck there. Several options are possible to get around this.
1. Make it so the queue is not an A* barrier.
2. Decrease the social force behavior's update interval to something like 0.4 (less than the time it takes for the operator to travel one node width.
3. Increase the node width.
4. Decrease the operator's max speed.
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