
Inserters number 5 and 6 from the left won't load the train. Turning them with R gets them working again, as does removing/replacing them or just putting another type of inserter down on top. When the train leaves the station they break again (even just moving half a square will do it).
I thought it might have something to do with being over a chunk boundary, but I haven't been able to replicate it yet. None of the others break either, just those two. It's weird.
