NetIQ Control Center Console 7.0.x
The Message displayed is "The same user cannot launch more than one instance of AppManager Control Center console on the same machine",
In the task manager "AMCC.EXE" is running even after the Control Center console is closed.
From Windows' Task Manager, locate and manually "End" the process AMCC.EXE on the Console machine.
The Control Center Console should now be able to be launched.
The Console occasionally will take additional time to close all connections before the process terminates.