Any time you engage any of the sleeping goblins or bugbears on the upper level of the goblin camp it locks saves from that point forward, even if you finish the dialogue. For example waking up one of the bugbears, but convincing him to leave you alone makes its so that you can no longer use the save feature as it says you are now mid-dialogue. If you wake him again to initiate combat and kill him the game still treats it as mid-dialogue and wont allow saves to be made.
