Problem: Creating a histogram using a numeric field other than the default causes a fatal error
This problem is addressed in ArcGIS 8.1 Service Pack 1. See the Related Information section to download this pack.
A fatal error occurs when obtaining a histogram for a numeric field that isn't the default 'Value' field.
This is a known issue with ArcGIS 8.1.
Solution or Workaround
This is fixed in ArcGIS 8.1 Service Pack 1.