I use to make a killing selling the Hearth Essences but they no longer appear in my trade windows and there is no gold price on them. Is this working as intended?
Yes, this is intentional.
It’s in the patch notes of one of the latest ACE releases:
You can find this and all the other notes on that thread
this makes me a very VERY sad panda
In ACE, you can use them to make Wooden Geomancer Signs, which sell for 32 gold… for now.