Errors in Safari by trying to play the YouTube video that has an ad at the beginning

Having this issue for a while (since Yosemite).  I'm on the last, largest OS X and Safari.  When I visit YouTube and the video has an announcement, Safari will not play video.  I get an error.  If I go to Chrome on this user, he plays very well.  If I go to a test account, Safari it plays very well.  I Reset Safari back to installation costs as possible (trying to solve a problem of WebEx where the Safari doesn't launch WebEx but just turns and turns) and still get this error.

Does anyone have an idea what is the cause of the issue is, how can I solve it and solve it?  It would be awesome if it also solves the problem of WebEx.  As it is, I spend much more time in Chrome because 'it works' Safari held counts these nagging questions and no real way to solve problems. And Reset Safari receive one together much more complicated with the recent versions when the Reset Safari option has been removed.

1 force quit Safari.

Force quit.

Press command + option + esc together keys at the same time. Wait.

When the Force Quit window appears, select Safari if not already.

Press the button to leave the bottom of the window.   Wait.

Safari stops.

2. restart Safari by holding down the SHIFT key.

This will launch Safari mode without failure.

3 turn off wifi and turn it back on.

Turn off the Wifi. Click the Wifi icon in the menu bar, then select "Turn off Wifi".

Visit another website.

You have no internet connection.

Turn on Wifi. Click the Wifi icon in the menu bar and select ' turn Wifi on.

Select your network.

4. remove the Cookies

Safari > Preferences > privacy > Cookies and other data from the website:

Click on the button "Details".

Delete all cookies except those from Apple, your internet service provider and the banks.

5 safari > Preferences > Extensions

Disable all extensions, restart Safari and test.

Tags: Mac OS & System Software

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