If the time and date of the inverter are incorrectly set during installation, there will be a problem synchronizing the data on the IMEON Online server. As a result, no values will be displayed on the screen. A message "Date is not configured properly on this inverter" will be displayed at the top of the screen. 

This is a normal behavior, the server is not able to display correctly the consumption or production data. To have a consistent display again, you just have to change the date and time of the inverter by connecting to the OS ONE interface so that it corresponds to your time zone. (Reprogram date/time Inverter)