Recently Google Chrome introduced the ability to activate plugins only after user confirmation. While this is a very good setting to increase your security level (especially for flash plugin), it prevents certain sites to display their content, e.g. imdb.com.
The video window on imdb.com will stay black, no error message, no way to activate the flash plugin. If you want to make it work, add an exception to the plugin content settings.
Within chrome, go to "Settings" -> "Privacy" -> "Content settings..." -> "Plugins" -> "Manage exceptions..." and add the following to the list of plugin exceptions: