This is regarding What natural ingredients can be used to color food blue or green?
This is also covered by Your vote is now locked in unless edited, even though it *was* edited
When I first loaded that question, and started reading it, it was showing the first revision. I went ahead and downvoted it. Later, I come back, and see Aaronut's revision, and try and redact my downvote. The site informs me that my vote is locked unless the question is edited. Which of course, it has been—I voted on the first revision. But I guess Aaronut's edit was actually between when I loaded the page and when I clicked the down arrow. Guess you shouldn't spend much time considering your vote…
I suggest that the revision number I'm looking at should be sent to the server along with my vote, and the server should reject the vote if there is a newer revision. Naturally, a proper error message should be displayed ("this post has been edited since you've started reading it, please refresh the page…").
[Apologies in advance if I was supposed to do something to the other question; not sure how one "re-opens" a bug on meta.SO. But it sounds like Jeff declined it due to it being a lot of work, but the suggestion to just check revision numbers should make reasonably easy to implement, I hope.]