This latest Intel Graphics driver posted 3/16/2105 (15.36.18.4156) is really buggy on my NUC5i3RYK with Windows 8.1 64-bit. Specifically, when resuming from sleep (S3), the HDMI connection is corrupted, with screen artifacts everywhere and crazy screen refreshes making it impossible to continue without rebooting the NUC.
I rolled back to the previous driver version and everything's fine again. Just a heads up to other users.