what do you do about blocked plug-ins

Usually, you can fix this by updating the plug-ins to current versions.

When you have installed the latest version of Flash, relaunch Safari and test.

If you're getting a "blocked plug-in" error, then in System Preferences… ▹ Flash Player ▹ Advanced

click Check Now. Quit and relaunch your browser. More advice here:

http://www.macworld.co.uk/how-to/mac-software/unblock-safari-plug-ins-on-mac-360 8065/