Hi,
I made a KiCad beginner workshop yesterday (with about 45 people), and at least two of the participants appared to run into serious issues regarding netlist handling. One of my colleguages as well (I hope he creates an bug-report soon).
The Issue appeared on KiCad 5.1.1, but it could be a regression already present in 5.1. Basically, it causes some nets to be not connected, which results in missing ratsnets in pcbnew as well as ERC errors (not-connected pads). Visually, all pins are shown as correctly connected in eeschema. In pcbnew those pads are not connected at all (so no ratsnets bug).
Dunno if this fix works for all people, but closing eeschema and opening it again causes a corrupted file warning (I think warning about an invalid netlist), which causes KiCad to create the netlist again and building a valid one which resolves the issue.
As summary: it seems there is a serious bug in KiCad 5.1.x which causes netlist errors and file corruptions.
I told everyone which had this problem to create a bug-report on launchpad to give some additional informations. If the issue is not found until KiCon, I would suggest to have one of the main-developers attend the beginner workshop to look for anyone having this issue and reproduce it.
Regards, Thomas
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