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I see this on the frontpage of UX:
Do we really have 0 visitors a day? Or is there something wrong with the statistics? (Always lying :))
This is probably related to the rename from http://ui.stackexchange.com to http://ux.stackexchange.com and I expect the stat will start functioning again in a few more days.
But I'll check to be sure.
Jeff is correct - it will take 7 days for google analytics to catch up with the name change.