Since the update of security this week, YouTube is not going fullscreen in Safari. Help?

I did the 2015-005 security update yesterday, and now YouTube will not be full screen. It works always fine in Chrome. Help?

Safari/Preferences/Advanced - activate the menu to develop it, then go ahead and empty Caches. Quit/relaunch Safari and test. Then try Safari/history/Show History and remove all items from the history.  Quit/relaunch Safari and test. You can also try try Safari/Clear History... The downside is that it deletes all cookies. It could upset some sites no longer recognizes your computer as one that has visited the web site. Go to Finder and select your user folder. With this Finder window as the windshield, select Finder/display/display options for presenting or order - J.  When the display options opens, check "show the library folder. This should make your visible user library folder in your user folder.  Select Library./Caches/com.apple.Safari/Caches.db, and then move it to the trash.

Go to Safari preferences/Extensions and disable all extensions. Test. If correct, enable the extensions one by one until find you which extension is causing the problem.

Corruption Safari       See post by Linc Davis

Tags: Mac OS & System Software

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