I did not see the furnaces were upgraded to automatically split ore. I added around 15K metal ore and 15K sulfur ore to a large furnace and the meatal ore disappeared. I redid this experiment with a small furnace and it did the same thing. The second ore you add gets swallowed by the furnace and disappears. This is on EU Survival, but I assume this is happening on all servers.
In other news, I like the auto-split and fixed Jpipes! Thanks!