The code to expired the iBox cache after iBox edits hasn't made it into production. It will later today. If you want to edit an ibox and see the results immediately you can do so via the beta site.
On an unrelated notes it appears that some users are having intermittent access problems due to network issues outside of our box. I know that it has affected at least some AT&T and Comcast users. We're making inquiries.
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