As far as I can tell, Headcrumbs simply isn't detecting the compatible mods. I've got tinkers, thermal, grimoireofgaia, etc.

The only heads that display in creative mode are the added vanilla mob heads (horses, pigs, etc)

Enable mobs and animal heads is set to true.

After greatly upping the drop chance, only horses, villagers, etc are dropping heads. No GoG, Thermal, twilight forest, etc.

Here is my mod list

Let me know if you need more info :)

Same issue for me, no Twilight Forest or GoG heads.

I'll have to take another look into these. My guess is mod id's changed and they have not been reflected in code yet.

All mobs, minus Lycanites should be re added now in the latest dev build

I recently reinstalled Windows so I don't have a dev environment for Java setup at the moment. I have the same issue with Twilight Forest. Do you think we could get an updated version with these fixes as as well? Much appreciated.