It seems that you are having some issues with one of your Slingboxes since you cannot get the remote connection when using the SlingPlayer for Logitech Revue application.
We recommend you run the manual configuration on your second Slingbox. This way, you should be able to get the remote connection to your Slingbox as soon as you finish this configuration. If you do not know how to, just check these links:
Make sure to follow these recommendations and let us know how it works for you.