http://prntscr.com/svfcwx
I noticed this line of furnaces at the bottom glowing but not actively smelting. Not sure if this is because Krastorio replaces the vanilla furnaces with slightly different ones?
For that Lightorio should add a patch to manage all K2 entities, I'm sure that all other K2 building suffer of the same thing. Is a partial incompatibility, because not work on all, also can't be fixed from our side.