- DirecTV receiver model?
- Kind of cable connecting receiver to TV?
- Kind of cable connecting receiver to Slingbox?
It seems like you're possibly:
- HD DirecTV receiver of some sort outputting a HD resolution
- HDMI or Component to TV
- Composite (red/white/yellow RCA cables) to Slingbox
You might be suffering from this when the DirecTV box is supposed to be generating an On-Screen Display (OSD) graphic (guide/list/etc), but I'd think you'd see some sort of warning as mentioned in that article.