Edit local environment settings
A message stating "res.nimg.jp / www.nicovideo.jp is requesting permission to save files locally to your computer" will appear. Click Allow at the bottom of the window.
Select "Proceed to check Player Display" from the bottom of the page.
Check your browser and close all unnecessary browser windows (except the two below)
to make sure Adobe Flash Player settings are saved properly.
●The window (or tab) displaying this help information
●The window (or tab) being used to change your settings
Once you have completed the above click the "Website Local Settings." (see below)