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Safari 5.1 won't play video on YouTube

17319 Views 25 Replies Latest reply: May 3, 2012 5:54 AM by indigo222 RSS
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SlippySlope Level 1 Level 1 (45 points)
Currently Being Moderated
Jul 25, 2011 9:29 AM

I did all of the latest Apple upgrades last night and now Safari 5.1 will not play video on YouTube (get message that a plug-in is missing - it doesn't specify which plug-in). Have the same problem with video on So, is Apple picking a fight with some commom video format or is this just a bug (and we're the beta test site)?

MacBook Pro, Mac OS X (10.6.8), iPad2/iPhone 3GS
  • Alan Burton Calculating status...
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    Jul 25, 2011 10:31 AM (in response to SlippySlope)

    I have a problem with you tube videos on a Rotary site. They both work fine on Firefox and ran Ok on Safari until recently. Noticed the problem after I upgraded my iMac to Lion . Checked the MacBook and it was OK on Safari. I thought that it was Lion> Last night ran software updates including Safari 5.1 and problem now occurs on Macbook.


    The videos are Rotary ones (not private) and have been embeded. One appears outside the confines of the Safari page and will run the other does not work at all. Have tried switching off extensions but no joy.   Reorted problem to Apple. Any one else with same problem.

  • TheSquirt Level 1 Level 1 (0 points)
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    Jul 25, 2011 11:12 AM (in response to SlippySlope)

    No flash items will work since I upgraded to 5.1 and everytime I switch windows, the page is blank and I have to wait for it to "redraw" before I can view it... very annoying. I am now using Chome until Apple gets with the program and fixes this fiasco. This update was definitely not ready to be posted.

  • erdried Level 1 Level 1 (20 points)
    Currently Being Moderated
    Jul 25, 2011 1:36 PM (in response to SlippySlope)

    What version of Flash did you have installed (that would be the plug-in in question)?

  • TheSquirt Level 1 Level 1 (0 points)
    Currently Being Moderated
    Jul 25, 2011 1:39 PM (in response to erdried)

    Whatever flash plug-in update software update pushed through. I haven't had to update Flash for my mac since Safari began. It was always done by Apple

  • Carolyn Samit Level 10 Level 10 (84,200 points)
    Currently Being Moderated
    Jul 25, 2011 1:52 PM (in response to SlippySlope)

    Uninstall the current copy of the Flash plugin then reintall new.



    Troubleshoot Flash Player | Mac OS


    Make sure and empty the Safari cache before you stream YouTube content after you reinstall the plugin.


    Safari / Empty Cache.

  • erdried Level 1 Level 1 (20 points)
    Currently Being Moderated
    Jul 25, 2011 1:56 PM (in response to TheSquirt)

    TheSquirt, Apple stopped bundling Flash with updates. Thus, your version of Flash is likely out of date.


  • TheSquirt Level 1 Level 1 (0 points)
    Currently Being Moderated
    Jul 25, 2011 1:58 PM (in response to erdried)

    I wish Adobe and Apple would kiss and make up already. Maybe then the iPad would function as well as the other tablets and be worth purchasing.

  • unclepete Calculating status...
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    Aug 23, 2011 9:24 PM (in response to SlippySlope)

    I just had the same problem and fixed it almost immediately and more simply.  Unless someone has already posted this (sorry) here's what I did.


    1. Down load Applejack

    2. Follow instructions and restart holding command S (single user mode)  makes you feel kind of really knowledgeable when that code like screen comes up.  Scarey , but don't worry.

    3. Follow the applejack instructions towards the bottom of the screen and you should be good to go.


    Hope it works as well for you as it did me.


    Good luck.

  • Niko521Bucs Level 1 Level 1 (0 points)
    Currently Being Moderated
    Sep 1, 2011 3:58 AM (in response to SlippySlope)



    For some reason only a select number of people have this problem. Including me. SO I right clicked on the YouTUbe video, but found NO FLASH options. Instead, something different, including the problem.


    Go ahead and right click on your youtube videos that wont play. If you see a menu with the bottom one saying ABOUT HTML5, click on it, and go down to the bottom, and OPT OUT Of HTML5.


    Your you tube videos will now work., as did mine.


    Obviously, Apple is trying to get everyone out of flash and into html5, but guess what Apple? Try to make your html5 WORK FIRST before you do it. instead we all got spinning you tube players that never started.


    MAKE UP WITH ADOBE PLEASE! You can then squash all iphone and ipad competition. Maybe now that jobs is gone Apple wont be so hard headed.

  • vjtk Calculating status...
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    Sep 6, 2011 7:19 AM (in response to SlippySlope)

    @unclepete THANK YOU!! I tried uninstalling 5.1, back to 5.0.5 only to have the same issues. Then back to 5.1 and the issues got even worse, this is after making sure all Internet Plugin's were eliminated and newest flash plugs installed. I was at the end of my rope! Not only was I having problems with Safari not playing videos on YouTube (only would play audio) and other video sites, but some of my pro applications started getting weird on me, saying I had no VRAM (thats a whole other topic!). I made sure I had applejack for SL installed, then did the "Command-S" at startup, went through all 5 steps, and POW!! When I rebooted everything worked, including 5.1 complete with YT video and audio with no weird page refresh issues!!


    APPLEJACK IS THE ANSWER. Everyone needs to try that FIRST, before messing about with the plugs, installs, prefs, etc.


    Model Name:                    Mac Pro

    OS:                                    SL 10.6.8

    Model Identifier:               MacPro3,1

    Processor Name:               Quad-Core Intel Xeon

    Processor Speed:               2.8 GHz

    Number Of Processors:      2

    Total Number Of Cores:     8

    Memory:                            8 GB

  • dominicfromquebec Calculating status...
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    Sep 15, 2011 6:53 PM (in response to Niko521Bucs)

    Nico521Bucs! You're the best! Thanks!!!! ^^

  • nmphotog Level 1 Level 1 (5 points)
    Currently Being Moderated
    Nov 17, 2011 2:05 AM (in response to SlippySlope)

    Same issue.  Tried everything.  This worked immideately.



    Open Preferences.  Click "Security".  Click "Remove all Website Data"

  • zer01chi Calculating status...
    Currently Being Moderated
    Nov 17, 2011 3:09 PM (in response to nmphotog)

    Second this solution. Easy and quick fix. Worked for me as well.

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