Sharpdevelop 4.4.2, can not step in debugger past Oracle component

My first attempt to work with SharpDevelop. Used v.4.4.2 (because client machine only has .NET 4) and build a simple C# app that connects to Oracle via Oracle.ManagedDataAccess.dll v 4.121.2.

The program runs ok, the program debugs ok, but I can not step through the application because it halts at the statement : xcon.Open(); Nothing happens (no error, no nothing).  In VS2013, no issue with debugging at all.

Best regards,
- Peter -

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            try
            {
              string constr = "user id=XYZ;password=XYZ;data source=XYZ";

              OracleConnection xcon = new OracleConnection(constr);
==>        xcon.Open();   
              System.Console.WriteLine("Connected to Oracle Database {0}", xcon.ServerVersion);

              OracleCommand cmd = xcon.CreateCommand();
              cmd.CommandText = "select * from PROJECTS";