something weird going on on my version 7 KiCad: without a clear cause the connection in between 2 components disappeard in the PCB editor. They are clearly connected in the schema editor and hitting F8 in the PCB editor does not show any errors, nor does the ERC. I deleted one of the components to no avail. I deleted the component in the PCB editor and did F8 again, but the component does not come back.
What is going on?
Is it possible your schematics symbol, let’s say a diode, has its pins named, for example, 1 & 2 and the PCB footprint is named differently, for example like A & C? In that case the netlist will probably not know what to do.
OK, found it: my upgrade from KiCad 6 to 7 has reverted footprints for resistors to the version I had before the one in KiCad 6. For some reason only 1 component showed this problem while the old footprint was linked to at least 30 other components. Upgrades are always tricky …