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A couple of times recently I have commented on a blog post here on EPiServer World. A little later when I checked to see if there had been any other comments added, my comment had completely disappeared!
At first I though I was going totally crazy and added my comment again only to refresh the page again and see both my original and duplicate comment!
It turns out that EPiServer World is a load balanced site and unfortunately the load balancing cache invalidation for the Community functionality has a bug which means it doesn’t always work. So you add a comment on one server but then later another server answers which has the old comment list cached.
I’m told this will be fixed in the next few days (not a guarantee) when EPiServer World is upgraded to Community 4.