If your Silverlight player is off-center on your computer, preventing access to player controls or showing a black bar at the top of the page, it's usually caused by blocked or failed advertisements that have been added to the page by third-party software. Netflix does not push advertisements to members that use our service. If your browser or security software is blocking ad content, you may see an empty black space:
To resolve this issue, use the anti-malware, anti-adware or anti-virus software recommended by your computer manufacturer or a trusted IT professional.
While Netflix as a company does not endorse or advocate specific vendors, our Support Engineers have successfully used Malware Bytes (malwarebytes.org) to resolve similar issues. Here is list of reputable software vendors that sell or provide free tools to help prevent or resolve this issue on your Windows or Mac computer:
Trend Micro: trendmicro.com
Whichever program you choose to use, be sure to keep it up to date with the latest software release.