711 days ago, when there was a thread about karma levels and I just hit 500, I encountered the same phenomenon. I received a response saying that you don't get to downvote threads created prior to crossing 500. (Obviously, can't verify that, but here's the thread for context: https://news.ycombinator.com/item?id=3812967)
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500 is often reported but is incorrect. As of today, it appears to be 501.
711 days ago, when there was a thread about karma levels and I just hit 500, I encountered the same phenomenon. I received a response saying that you don't get to downvote threads created prior to crossing 500. (Obviously, can't verify that, but here's the thread for context: https://news.ycombinator.com/item?id=3812967)