Hello Clint,

You didn't say which version of PurchaseOrders you are using. I am going to guess that it is the 93A version.

If it is, check your User Preferences from the File menu. If you have the option to 'Ignore style properties' selected, uncheck it. When it is selected, the setting for Band Grids may be causing the pastel green to appear.

If you do not have this option selected, check the Grid Filters list. Sort it by Priority and make sure that there isn't a filter with really low display priority that is taking precedence over the filters you normally use.