I found a bug:

enter image description here

Look at the question: Can the number of cookies set on localhost create problems?

Two answers are clearly marked as correct. I hit refresh and it stays. On both of the member's profiles, the question shows up as marked correct.

Is this a bug, or just a "new feature"? Thanks for checking it out for me!

I tested myself on a question, it still flipped which one was marked for me.

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1  
Timeline also shows that both questions have been marked individually as accepted. 9 seconds apart, maybe a race condition somewhere? –  Jeff Mercado Jun 27 '11 at 0:43
    
@Jeff Looks like it. –  Cyclone Jun 27 '11 at 0:45
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I refuse to upvote this until it's retitled "Checkmark Overflow" –  Michael Mrozek Jun 27 '11 at 1:20
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Probably a merge condition –  random Jun 27 '11 at 1:23
    
The API shows this one to be the correct accepted answer. –  uɐɯsO uɐɥʇɐN Jun 27 '11 at 1:33
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I've merged two questions that both had accepted answers before, and I've never seen this. The accepted answer on the target stays accepted. (Of course, this doesn't discount recent code changes around merging.) –  Bill the Lizard Jun 27 '11 at 1:36
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@George, if the API can tell which answers are correct, then why doesn't it automatically tick the correct answer as soon as it is posted? Or even better, why doesn't it just auto-answer with the correct answer? ... ;) –  user147272 Jun 27 '11 at 1:37
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The checkmarks are both gone now. –  Jon Seigel Jun 27 '11 at 2:00
    
@Michael: Done :) –  Cyclone Jun 27 '11 at 3:06
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possible duplicate of Answer accepted twice; see also the similarly named Answer accepted twice? and Question with three accepted answers –  Pops Jun 27 '11 at 14:34
    
Please close as a dupe, not too localized. (It's 2/2 now) –  Jon Seigel Jun 27 '11 at 16:35
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1 Answer

up vote 9 down vote accepted

It is a bug, it happens VERY rarely.

I already have a daily job that clears this mess up and alerts us when it happens.

I do not particularly want to add a crazy amount of locking and checking just to combat the very rare cases.

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@YOU 404? What was it? –  Cyclone Jun 27 '11 at 3:35
    
@YOU yes ... sorry we did not want to advertise that ... it was benign bug ... but still –  waffles Jun 27 '11 at 3:52
    
ah ok, got it. –  YOU Jun 27 '11 at 3:53
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Done it "clear it up" by deleting both? Because that seems kind of bad –  Michael Mrozek Jun 27 '11 at 3:54
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