Issue description
Dump space had filled and caused a backup of slag at my copper facility.
Having fixed that issue by creating more dumping space, the facility began again to make molten copper, but it refuses to enter the casters.
I rebuilt the furnace and molten channels and still it refuses to accept the molten ore.
It was working fine, until the slag backup stopped things.
Slag has been removed so there is no problem there.
Coal and Copper ore are full and connected. and the furnace is working fine.
There are no backup or full storages. Belts and storages are empty on the line.
Reproduction steps
I cannot attach a zip file as I do not currently have winzip.
I do have 7zip but this is apparently unsupported. Go figure.
Game version and build number
Update 2 v0.6.4c b341
Operating system
Windows