This screen capture shows the output of a simulation run. The selected region shows a fragment of the signal, but the signal outside the selection region disappears: <img src="/editor/20150702/55948b883d744.jpg" width="500"> This screen capture shows the schematic editor showing that the horizontal interconnect missing: <img src="/editor/20150702/55948d88171c9.jpg" width="500"> Zooming in slightly in the schematic editor causes the horizontal interconnect to re-appear: <img src="/editor/20150702/55948dd82898b.jpg" width="500">

Yes. When the scale factor bellow 100%, the lines will be hidden some time. This is caused by browse. We don't have a good method to solve this, maybe this is a bug of Firefox Thanks.