Bartleby
Remembers laughter
I looked again at the "turn before" save in CAII and it turns out I was importing spices from Russia; that must be the problem. That trade would have been for tech upfront; I didn't realise that was rep-risky. 

If I re-negotiate peace with Russia to include an alliance against the Zulu, will my reputation take any kind of hit assuming the Zulu are destroyed by the Americans?
I am not sure the spices import has anything got to do with it. Rather, the problem lies here:
I think that combining those two is simply a no-no. You can combine an alliance-against-a-doomed-civ with almost anything you like without ever facing the risk of taking a rep hit, just not a peace treaty.
I'm not convinced by this, Lord Em; I think there is something else going on here and it would be nice to get to the bottom of it.
http://forums.civfanatics.com/showthread.php?t=2465903) Make an agreement (Military Alliance (MA), for instance) that include peace treaty. When AI break Alliance they automatically declare war and WH
[...]
Obviously 3) also does not guaranty WH. Additional drawbacks of 3) might be also considered.
(i) If you bring AI at too many wars and cant help him and AI will be killed while in treaty your reputation will gone.
(ii) If you kill your common enemy you come to the situation of war with your former friend without his declaration. This war will not cause WH and your reputation also gone. This bug (feature (?)) specific for MA + peace deal only. Other MA + trade deals will not trash reputation if you kill common enemy.
few questions about the UN and diplo victory
if you build the UN, do you always control the vote? I know when it is first built you get the option to hold the vote. If you decline, how do you initiate another vote? Can anyone initiate another vote?
also can you sabotage wonders? or how does sabotage work? Never done it before...
In a game with diplo VC enabled and there is no way I will win the vote. If I build it, can I just never have a vote?
few questions about the UN and diplo victory
if you build the UN, do you always control the vote? I know when it is first built you get the option to hold the vote. If you decline, how do you initiate another vote? Can anyone initiate another vote?
also can you sabotage wonders? or how does sabotage work? Never done it before...
In a game with diplo VC enabled and there is no way I will win the vote. If I build it, can I just never have a vote?
Can Hwach`a trigger Golden Age?