That’s right. I have ever suffered the same problem:cry:
Adjusting Blu-ray menu can solve this but WD actually read the blu-ray structure from ISO and MKV- at least my Live plus does. Anyway I recommend you choose MKV because when playing ISO with WD TV it will not allow you to select chapters. Here’s a guide of Blu-ray to MKV ripping for WD TV Live here. Hope it helps.