This is fixed in version 1712 (Build 8827.2179). To get the latest update immediately, open Outlook and choose File > Office Account > Update Options > Update Now.
Several users noticed their tasks disappeared in the To-Do Bar and To-Do List.
Suddenly items on my To-Do-List disappeared. Some tasks are shown but others appear as blank lines. In the To-Do List, the subjects are blank.
Flagging a message causes erratic behavior in viewing the To Do List, with nothing showing under Today except a lot of blank entries. Tasks for today are no longer visible in the list - although they can still be seen when looking at the Tasks page.
This bug affects all users with more than one data file in their profile.
If the data files are pst files, the problem only occurs if an email account is delivering mail to a pst or the pst is enabled for reminders.
There a few workarounds you can use to see your tasks again:
- Turn off the option to automatically group by a field in View Settings.
- Right-click on the row of field names and untick Show in Groups
- Group by Category or Folder (any arrangement that does not group by a date).
If you need to group by the Start date or Due date, open View Settings, Group By. Untick Automatically group by arrangement and select Due Date in Group items by selector.
To change the view on the Task list in the To-do Bar, right click on the row above the tasks that reads “Arrange by” and choose a different arrangement, untick Show in Groups or choose View settings to customize the view.