After my upgrade, I opened Workbench and can see several existing Agent icons. Can the displaying of agents be turned off in the Explorer window? Why are the agents being displayed? How do I removed them? I can easily imagine my users locking out my agent accounts by entering incorrect passwords if the agents are present in their GUI.
Those Agent icons represent agent connections that had previously been made with Workbench on that computer. To remove the connection, right click on it and select "Discard Agent Connection".