global monthly is no data at all, but per device monthly shows stats what appear to be right.
It probably means you didn't initialize the data files for the regular traffic monitoring. Go to the Tools -> OTher Settings, and check the first "Create or reset data files" to generate it.
In addition I have to change the data format (for me is dd.mm.yyyy) everytime I access the page it be cool if this was remembered.
It already does. The value is stored in a cookie named ymd (for daily pages) and ym (for monthly pages), and gets reused when you access those pages. Make sure you aren't blocking cookies on these pages.
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