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In Altium I don’t have any connections (ratnest) showing. They were showing previously, and in the viewer they are ok. They should be visible after going to view->connections->show all but are not. This happens on all the boards and workspaces I open.

There are plenty of unconnected SMD that highlight when I mouse over. The DRC report gives lots of unconnected pins. The net color doesn't match the background, and a few nets have special color assigned. All of this seems like the connections should show, but no luck.

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I'm aware of two common reasons for disappearing connections.

  1. Under View Configurations (shortcut L), make sure you have the "Show" checkbox ticked for "Default Color for New Nets".

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  1. In the PCB panel, make sure that "From-To Editor" is NOT selected.

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    \$\begingroup\$ Another, less likely possibility, is if every net has been set to "hide connections". \$\endgroup\$ – The Photon Sep 13 '16 at 20:26
  • \$\begingroup\$ Another possibility is that nets are coloured the same as the background. \$\endgroup\$ – Andy aka Sep 13 '16 at 20:33
  • \$\begingroup\$ Sure, but both possibilities have been mentioned by the OP. \$\endgroup\$ – Armandas Sep 13 '16 at 20:34
  • \$\begingroup\$ The From-To-Editor was the culprit! Once that was changed the nets appear again. Thank you! \$\endgroup\$ – Steve Scully Sep 16 '16 at 14:12
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Make sure you update the pcb from the schematic, compile both to make sure there are no errors. Also check the component links to make sure your components are linked from schematic to pcb file. Don't open up the PCB file without opening up the project. Make sure all files are in the project.

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