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I have encountered this bug twice today. How? I was reading a question, then I decide I would upvote it and click on the big Puzzling headline to go back to the main page. If the time between the two actions is too small, I see this message for a second: "An error has occurred". One of the times my upvote was not accounted so I had to redo it, but the second time the upvote was correctly counted.

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  • $\begingroup$ Sometimes you have to wait a few seconds for your vote to take effect. Especially if your internet connection is slow. $\endgroup$ – Rand al'Thor Sep 2 '16 at 11:52
  • $\begingroup$ Well, it is still a bug to me. So I figured I would report it as I couldn't find any topic related to it. $\endgroup$ – Maria Deleva Sep 2 '16 at 11:53
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    $\begingroup$ I suspect it has to do with the performance of the StackExchange servers, but I can't confirm that. I had a similar problem trying to post a chat message yesterday, and had to retry several times before I could post it. $\endgroup$ – GentlePurpleRain Sep 2 '16 at 15:29

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