I am new to KOrganizer. I have build 4.8.5. I want to create new events on the Calendar, but the data entry pop-up will not close. I complete the data on a new To-Do and hit OK and nothing happens. What am I doing wrong?

I looked on bugs.kde.org and didn't see any relevant bugs

what are you using as a calendar resource? settings -> korganizer settings -> general -> calendars -> add

And check that at least one calendar is actually _enabled_, i.e. that the checkbox next to it is ticked.
This does not happen automatically, not even for the default calendar unfortunately.