We need you to be more specific. Unfortunately, your post is not clear enough and we need you to give us as much as information as possible. Which SlingPlayer Mobile version are you using?
Have a look at this link if you are using an iPhone,
If you have a different mobile or if the issue persisted on your iPhone after trying the steps on the link above, you need to run the Setup at slingbox.com using a Mac or a PC and confirm that you have selected DVR instead cable box during the Video setup. That should fix the issue that you are having
Let us know how that works