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Since the early days of MathOverflow, I've subscribed to the RSS feed for all recent activity. Until about 2pm today, I had very little trouble with it. When I checked Google Reader just now, though, it had 30 new questions, all of them from Math.StackExchange.
Unsubscribing from the feed and then resubscribing to the link at the bottom of MO (which at least in Chrome on a Mac brings me to a gibberish page of code, but Google Reader knew what to do) fixed the problem. Maybe I was subscribed to a feed from way back when we were still called Mathematics.StackExchange? In that case, perhaps the explanation is related to the discussion about Mathematics.stackexchange.com redirect.
The time line is about right, considering when the SO team made the DNS switch and the typical propagation delay.
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