We’ve had a few reports come in that some Google Analytics users are seeing an inaccurate/inexpiable spike in traffic for the 26th of March, 2013 (AEST). We’ve had a closer look at our various analytics profiles and have noticed this happening on a number of our client accounts.
It appears to be restricted to the 26th, and no other data has been affected. As of yet we haven’t seen any official response from Google, but imagine it will be fixed soon.
Currently the only work around is restricting date range to just to the 26th which should provide the correct data for that day.