How to reproduce:
- log into Piwik, set for ex. "last7" as default date, log out,
enabled_periods_UI = day,week,month,year
- try logging back into Piwik - you should be served an error message saying that period is invalid.
I guess that in such case, user setting should be ignored and "yesterday" loaded instead or something like that.
Please let me know if this is enough to reproduce issue
Thanks for report @mgazdzik