This quest states that you fail if you reach industrialism. The quest actually fails when you reach the industrial era. No idea if it is the text that is incorrect or if the quest is failing at the wrong spot. Two saves are below, in both cases the quest parameters have just been met, and all that is required is to end the turn to complete the quest successfully. In the first save, the quest completes. In the second, nothing happens because I have Scientific Method.
quest completes: http://forums.civfanatics.com/uploads/53201/blessedseabugcompleted.CivBeyondSwordSave
quest doesn't complete: http://forums.civfanatics.com/uploads/53201/blessedseabugincomplete-0705.CivBeyondSwordSave
Two minor issues that may or may not be working as designed.
That is the only quest I had when I took the screenie. But if the window is normal size, all the text isn't visible, and I was unable to scroll down to read more.
In the two saves above, after completing/failing the quest, the text in the quest log didn't change at all. There was no indication that I had passed/failed the quest, if I didn't realise I had, I would just assume the quest was still outstanding.
I have no idea if those two issues are specific to this quest or occur for all quests, as I haven't checked before.