I've noticed some very strange GA behaviour on one site - yesterday's stats showed 351 sessions to a site when I first pulled up the report (medium precision) then when I selected the highest precision report in only showed 81 sessions.
I then checked the report at the lowest precision and it showed 4,085 sessions.
Do you think they have an error in the system or do you now have to go to the highest precision to get anything near a sensible report from GA.