I'm bugged too, any fix on this problem coming?
Context :
After the last Milford combat before the divine quest and the dialog with Duncan where he ask to solve the problem the quest was launching and I had a combat button but, as my team was injuried I prefered to wait for some turns.
When I came back to Milford I had no longer any combat button.
edit: ok, found the solution. Not really a bug bug a lack of information in the journal:
The divine symbol must be crafted at the forge but the priestess just say that discretly in her text and it's not indicated in the journal so if you pass the priestess texts to quickly or don't read them you are lost :)