Upgrading to Windows 10 build 1511 from Windows 10 (or possibly a lower
version) will result in your LiveDrive briefcase (L:) appearing as
"Disconnected network drive" despite functioning normally.
Open the registry editor (WIN+R, type "regedit") and navigate to the following location:
Edit the details for the key "ProviderOrder" to place the string "CbFs3," at the beginning of it.
BROKEN AFTER WINDOWS 10 1511 UPDATE:
Close all open File Explorer windows and re-open one. Navigate to "This PC" and you should see everything in order again.