I am having a similar problem I found posted earlier except the posted solution hasn't really helped.
The problem is I can't export my model to BPMN because my user tasks have no assignee, candidate users, candidate groups set
I can't solve how to get assign something. The Problem view for user tasks under Main config has Performer type, but selecting somehing has no effect. In fact, the change doesn't hold after saving.
Can I trouble somone to explain in some detail what exactly are the steps to solve this problem?
Thanks.