On the NUC target:

There is a slight "halo" effect on round buttons, it could be an alpha color error on the original graphics or a round button effect or problem with overlap of graphics/effects.

Noticeable on:

• music app and widget "play button", presumably "stop" as well (not functional since no music available at the moment)
• "end-call" button in phone widget (but not in the fullscreen-mode for the app) in call mode