A blank screen in the Windows 8 Quickflix app can be caused by something that's preventing Quickflix from storing information on your device.
Does your Windows 8 device have anti-virus software installed?
Sometimes anti-virus software can interfere with the player Quickflix uses to play movies and TV shows. Disable your anti-virus software and play your movie or TV show again.
If playback commences once the anti-virus software has been disabled, please seek assistance from the manufacturer of the software.