An interesting single pin routing bug..

[sponaugle]

While working on a board layout I encountered an interesting single pin routing bug. .dip and .dch attached and can be reproduced pretty quickly.

If you open the .dip, use the Design Manager box on the right to select say 'Net 34' and then right-click 'Route', it will route that net. Simple. If you do the same to 'Net 36', it works great.

However if you select 'Net 35', it will not route that path, even with no other routes on the board. If you 'unroute all', then run 'Autoroute', the entire board will pretty quickly route up to that one net, net 35, which never routes.

Something is weird with net 35 compared to all of the other nets, even though that net is a simple 2 pin net with parts that are directly across each other. The ICs are the same across the board, so it isn't a pattern keep out problem, nor does it appear to be schematic related.

If you change the autorouter setup such that 'SMD fanout' is enabled, it will route that pin, albeit weirdly. It is almost like there is some virtual part right next to that one pin that keeps it from routing.

Curious to see if anyone has seen this.

(Diptrace 4.0.0.5, Mac OSX 10.15.7)

Jeff

[Tomg]

It is interesting that the Shape Router falls on its face, but the "obsolete" and/or "not-recommended" Grid Router has no problem with it. Unless I am overlooking some mysterious setting somewhere, it appears that a bug has found its way into the Shape Router for version 4.
(Diptrace 4.0.0.5, Win10)

[sponaugle]

It is interesting that the Shape Router falls on its face, but the "obsolete" and/or "not-recommended" Grid Router has no problem with it. Unless I am overlooking some mysterious setting somewhere, it appears that a bug has found its way into the Shape Router for version 4.
(Diptrace 4.0.0.5, Win10)

Ah yea, the grid router doesn't have the problem. Interesting. It must be some kind of glitch in the shape router with this particular pin arrangement. At least it is easy to reproduce if the dev team digs into it. Thanks for confirming it isn't just my system config!

Jeff