When you create a PSM and corresponding Printer Agents as an Administrator, log out of iManager, and then use a Manager User account type to log in to iManager and try to delete the PSM, the PSM is deleted, but the corresponding Printer Agents are not deleted. A PSM is not loaded message is displayed when you delete the PSM.
You can delete the PSM and corresponding Printer Agents with an Admin account type but not a Manager User account type.