yes I can confirm this. But in the mean time, that is why I waited untill today, I see that the problem with the display of "WEEK" is a "sunday-problem" During the week, all usage data is displayed correctly but on sunday the "WEEK" tab shows the "No mobile usage data collected" Error. This is again so today (sunday). So for the moment it is ok for me, but maybe the "sunday problem" may be fixed on one of the future firmwares.
Maybe nobody noticed it, as most of the people do not work sundays :-)
Thanks for the help, especialy the trick with the CLI an the config files.