Thanks for participating in our online forum community here! It sounds like another user is accessing your Slingbox at the same time as you. The Slingbox can only stream to one user at a time.
Here are a couple of articles from our support site with additional information regarding the Slingbox and Intenret viewing:
Hope this helps!
The Sling Moderation Team
Actually it may not be another user. I have seen this quite a lot when running the Setup procedure and it doesn't properly release the Slingbox on completion so that when you try and watch it you get that error message as the setup procedure still 'owns' the box.
But it only happens occasionally and the next run through always works.
Thanks for your help. There is no other user. I just have the program installed on one computer. I do get this measage when I try to exit out of the Slingplayer program "This Action cannot be completed because the other program is busy. Choose "Switch To" to activate the busy program and correct the problem" If I click Switch To it just pulls the programs up in the start menu. The Slingbox model is SB100-100. Any thoughts?