your screenshot not shows "completed tasks" ... these are "needs action" tasks (check the "status" field in the editor). 100% in "completed" field not changes the "status" field (these are two different vEvent attributes).
And tasks are always red if the currently selected date is > as "to" date. This is a design decision because we often needs to know which tasks will be overdue at selected date (and usually the "Completed" or "Canceled" filter is disabled).
JM
On Apr 12, 2013, at 9:11 PM, Graf von Roit zu Hoya <graf.roit@gmail.com> wrote:
Hello,
in the
ToDo window already completed
tasks are shown in red color as overdue.