Thank you, amagasakii, changing the setting fixes it.

I quite enjoy the shortcut underlines too, so hopefully it does get fixed.

Plankton, I received the update via Windows Update on 31st July, as part of a Windows Insider update.
RWOne, Yep, I've rebooted a few times since the update.

After installing the Windows 10 anniversary update, I have noticed that there is now a selection box or white border around some of the ShellExperienceHost applications (the time/date, wi-fi and...