Hi, This will raise a signal 11 and produce a coredump PUBLIC SUB Form_Open() DIM b[2] AS Byte b[0] = &H1 b[1] = &H2 txtBox.Text = Str$(b) END I know the Str$ is complete bogus, but to dump core on that... Gambas 2.7.0 Debian 4.0 Regards, Ron.