It may be difficult to remove the leftovers.
One thing you could try is to reinstall iDisplay and check if the problems go away.
Then uninstall iDisplay,
Just did as told, problem is still there.
Forgot to mention one thing. Recently, I discover under COMPUTER, my network drive is not displayed. But in Computer Management - Storage, it is there and is healthy. My other computers in my home network can see and access the network drive too. Can this be the culprit?