Netflix error in Safari: errorcode 2105

Netflix player stopped working from one day to the next with "ErrorCode 2105".

There was a link to nonsense about checking for fonts.

What helped:

1. Close Safari
2. Delete the file /Library/Internet Plug-Ins/Silverlight.plugin
3. Start Safari, access Netflix, try to play movie, install the now missing Silverlight again
4. Safari's Help/Installed Plugins shows Silverlight Plug-In version 4.0.50826.0