Yesterday, I didn't get a node for Shadow Behemoth and had not participated in that boss previously, nor the 2nd time I tried the same boss. I had no problems getting nodes on any other bosses, including Great Jungle Wurm, and when trying SB a 3rd time, I did get a node. However, just a while ago today I participated in Great Jungle Wurm, then Ulgoth, then SB. I did not get a node for ANY of those, even though I had not participated in any of them since before today's daily reset.