How do you respond to the password prompt TSS7150A SPECIFY PASSWORD FOR STC=stc ACID=acid message when a started task starts to stop the task?
If you don't want to get prompted for a password for a started task, you need to set OPTIONS(4) in the Top Secret parameter file so the started task doesn't prompt for a password.
Without it, you have to enter the valid password or the started task will not start. You can also cancel the task.