What does the Floating Nodes Check in the Preferences dialog box do?
A floating node is a node to which there is only one part connected. Many SPICE simulators
will not run if there are any floating nodes present. The presumption is that there is no point in
having only one part connected to the node, so it must be a circuit error. Micro-Cap can simulate circuits
containing floating nodes without any problem, so this option is used as a likely error checker.