To better isolate the issue, I'd need to have a little more information.
-Which Slingbox model do you have?
-What cables are you using? (component, composite, HDMI)
-Does the issue also occur on your computer via Watch on Slingbox.com?
-Is this a standard HD TV or a SmartTV?
This should help us narrow it down to what's causing the issue. Once you respond with this information, we can take a deeper look into the problem.
Sling Media Forum Moderation Team