I have a Sony Bravia 40" LCD HDTV. I have programmed my Comcast remote with code 10000 and it seems to work fine for most functions. However, when I click "Last" button to toggle between last channel and current channel viewed, both channels show up either stacking vertically or horizontally. Could this be a conflict with the Sony PIP or something. Anyone seen this issue? Advice for troubleshooting?