There is a test you can try if there is one of the shortcut is causing the issue. Move all your shortcut on your desktop into a folder. Try enable Fences after that is done. If Fences can be enable. Move those shortcut back into your desktop area until you get to the one that causing the issue. There were reports where shares network drive/cloud items causing issues.
Thank you,
Basj,
Stardock Community Assistant