I notice that when I set a DataGridView's Datasource in C# 2.0, VS 2005.NET in a windows form (on Win XP) that it works fine.  I can call this code multiple times.  (Valid select query)
But when I run the same .exe on the latest version of Mono Framework 2.0 on OS X it fails on the 2nd assignment, but works fine the first time.

Error: "unhandled exception: Index is less than 0 or more than or equal to the list count.  Parameter name: index 1."  And then the form disappears and closes.

Part of my code:
DataSet ds = new DataSet();  
DataTable dt = new DataTable();  
 
ds = MyWebService.GetDataset(InitialClientLogin, sSQL, ParamValues, out sMsg).Copy();  
dt = ds.Tables[0]; // Setup table. Choose the first table, since that is only one returned.  

MyDataGirdView.DataSource = dt; //dt.DefaultView; Crashes in Mono 2.0 on 2nd assignment