How to make change assignee of a task?

[lrcuhuh]

Activiti Explorer 5.13

I'm working in the demo context. I have a UserTask with sales as candidate group. The task shows up in the queue of all users of this group. But as soon as I take the task as say user gonzo, I can't reassign it to anybody, because the list of potential users is empty. Also on first assignment, the only option the the button assign to me.

Any idea why the list of the potential users would not be filled?

tia,
Heinz

[frederikherema1]

And if you type, for example, "kermit" in the search-box?