ADO/ADO.NET - VS 2008 app unable to update sql server compact. Can connect and select. No errors.

Changed app to use SQL Server Compact database instead of SQL Server 2008 R2.  Can connect and retrieve data into dataset but updates to rows don't work.  return code is 0 from ExecuteNonQuery and no errors thrown.  I have tried updating using the table adapter, ExecuteNonQuery using parameters and using a simple update statment.  Any thoughts?