When I look at google analytics, I often compare a specific day's traffic to the traffic on the same day of the previous week. As of yesterday, I started to see a red box that says "All domains must be of the same data type."
It only shows when I compare two dates or two date ranges, but doesn't seem to show up on older date ranges (ie, the month of June compared to May.
Does anyone know what that error means? Would it have anything to do with the fact that we have a mobile version of the site at m.site.com? Or why I'm only seeing it on some date comparisons?