As Tony said … it looks very much like you a running a custom theme.
Now, if there is a ‘problem’ with the theme … then the 1st thing to do is apply the “Mochi Default” theme
try this …
keep pressing the “SETUP” button (on the wd remote control) numerous times Quickly as the box was rebooting itself.
(this can take 30-60 Seconds)
eventually the “SETUP” screen will appear … then stop pressing the “SETUP” button … wait a few seconds
and the navigate to “APPEARANCE” … Navigate and Select “Mochi (Default)” Theme and press “OK”
if all is good … then Do Not use the custom theme that you or someone else put on the device.
Note: i dicovered the above procedure when i accidently made a mistake editing a theme … and it caused the WDTV to boot loop.
http://community.wd.com/t5/WD-TV-Themes/Be-Carefull-Editing-Home-XML-S/td-p/146450