Help creating a pie chart within a report

I'm trying to find the right settings to create a pie chart in a report.    My data is relatively simple and simply has a record for each location where an employee responded to an event.   The event type has ~10 domain options that I would like to visualize using a pie chart.

So if I have 100 records, with a mix of response types, I simply want the pie chart to show a count of the pie slivers.   Sounds simple?  But I have yet to find the magic combination of data settings for the pie chart.   When I'm in the wizard, more often than not, it doesn't save my series settings when I hit OK.