Try having [sendOSC] with no initial arguments, then after a short delay
send the message [connect localhost 8080( to it.
The dashed box is a bit of a bug which means the port is in use. If you
instantiate [sendOSC host port] and it fails then Pd fails to create the
object. But if you instantiate [sendOSC] without args and then supply a
connect message it will return an int on the left outlet, 1 = success, 0
= fail. In the case of a fail it probably means that something else is
on that port or you have an open handle. In that case try
$> lsof | grep 8080
to see if anything has the port.
Andy