I am running a Probe Transient Analysis on my circuit. When the analysis is finished, the schematic portion of the split screen has some of its wires missing. I can click on where the wire should be and a waveform will appear, and when I exit analysis and go back to the schematic, the wires are fine again. What is happening?
The wires that are disappearing should be connected to a node that is purely digital. (Purely digital nodes can be known from the fact that when the node numbers are displayed, the node number is within a rectangle. For analog and mixed nodes, the node number is within an oval.) In a Probe analysis or when in Animation mode for an analysis, the wires connected to digital nodes will change color to represent the last digital state that has been calculated at that node. In the case described, the color of the wire for the state calculated happens to match the background color of the window making it appear as if the wire disappeared.
To view the defined colors of the digital states, invoke the Properties dialog box for the schematic. This dialog box can be invoked by hitting the F10 hotkey, double clicking in the schematic while in select mode, or by clicking on the Properties icon. Go to the Color/Font page of the dialog box. At the bottom of the Objects list are the digital state entries. Highlight an entry to view or edit its color.