FTB Unleashed - Induction Smelter & rubber bars not working

[25hz]

I was using going to use the induction smelter to use sulfur and rubber to make rubber bars, and while I've processed a number of other things in the smelter, and it's fully charged and ready to go, it won't work for making rubber bars. I searched for it and found nothing. Any ideas? (sulfur in the left input and rubber in the left, as well as the opposite was tried)

 

[rhn]

I was using going to use the induction smelter to use sulfur and rubber to make rubber bars, and while I've processed a number of other things in the smelter, and it's fully charged and ready to go, it won't work for making rubber bars. I searched for it and found nothing. Any ideas? (sulfur in the left input and rubber in the left, as well as the opposite was tried)

You are using 2x Raw Rubber together with 1 Sulphur, right?

 

[25hz]

Yes, as well as stacks.