I just did a little test on this and it looks like you can only have one slaveID per port. There may also be a bug that prevents ports other than 502 being used. We'll look into that a bit more and get back to you.
take a look in the /logs.ma.log file and see if there is any errors or post the logs here.
Try running the start up scripts from the command line and see if you see an error? What OS are you running on?
If you are double clicking on the script it may popup and then disappear in which case you miss the error. Rather open the terminal window and run the scrip in the terminal and you will then see the error.