After adding or deleting a conduit from the PDASync conduit list, the conduit list disappears from the Conduit tab window. The list is updated internally, but the GUI does not repaint the list.
Workaround: To force a repaint of the conduit list, click on either the Synchronization tab or Log tab, then click on the Conduit tab. The conduit list appears correctly in the Conduit tab window.