Hi @LukeSkywalker,
this probably is the same problem as in topics 3742 and 3698 and a really old one 1767.
This might have to do with corrupt OSM pbf file, but that’s just speculation.
You could PM the previous authors if they ever fixed their problem, as this is not easily reproducible.
In general, if it’s a setting related directly to the graphs you need to rebuild them.
The “safest” way to do that is just remove everything in the graphs folder, so it has to be rebuilt.
(I think i remember the rebuild flag sometimes not working properly.)
Also as long as you are fiddeling with your config best use a small OSM file until you have the desired one, so build times are shorter.
Best regards