http://cache.gizmodo.com/assets/imag...ZXaotGM_9Y.jpg
It's tough to know just how often this particular problem is occurring, but we've heard a fair share of reports on the Zune HD's otherwise gorgeous OLED display having performance glitches. And needless to say, you'd notice it.
http://gizmodo.com/5374530/what-a-br...lay-looks-like