Matrix +/- Icon Option Removed

Thank you for the reply but I was already on the version you recommended.  I did reinstall but still do not see the option on the report I am using.  For testing, I created a new report, using the same matrix visualization, and the option was available.

Can you think of a reason why this option would be unavailable on one report but available on another?  Could connection be a reason?  The report where it does not exist is using a live connection to a cube.  The report where it does exist is connected to an Excel spreadsheet.  Other than that, there isn't much difference in what I am doing.