That's really odd. Usually, its the other way around. Problems like these are pretty difficult to troubleshoot without being able to witness the statistics. You can open the statistic window by pressing [Alt]+[Shift]+[i]. This window should able to help you determine what's happening behind the scenes.
If you're unable to decipher what its telling you, then I recommend taking a one minute sample video capture of the Slingplayer and the statistics window open. You can then upload it to video share site like youtube, and we can take a look. You can use a third-party virtual web cam software like mReplay Broadcast or Webcam Max to record or rebroadcast any portion of your desktop.