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Today I noticed that Safari doesn't show anymore the videos shown on Youtube; I just see a black rectangle, and when I try to use the popup menu in that area, it doesn't appear.

As far as I can remember, one week ago I was able to see videos on Youtube. Something is changed in this week; for what I can remember, Safari has not been updated, in these days.

How can I find the reason of the problem, and eventually resolve it?

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I don't have the same problem with Google Chrome. – kiamlaluno Feb 20 '11 at 16:49
Is this question related to this one? – Purple Tentacle Feb 20 '11 at 19:55
The Adobe site reports I have version of the plugin, not 10.2; the other question is referring to version 10.2. – kiamlaluno Feb 20 '11 at 19:58
I just think, its is the 10.2 Flash version. Maybe there is any other difference. Have you tried the User agent trick? – Arne Burmeister Feb 21 '11 at 11:11
@Arne Burmeiser: If you write that as answer, I will accept it; changing the user agent to "Safari 5.0.3 — Windows" worked. If I set it to "Safari 5.0.3 — Mac", or I let Safari choose it automatically, I don't see Youtube videos anymore. – kiamlaluno Feb 22 '11 at 18:27
up vote 2 down vote accepted

I have the same problem and the only solution I have in the moment is to change the User Agent using the Developer Menu. Safari 4.1.3 - Mac works for me. But this is not permanent! You have to change it every time yu start Safari :-(

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I updated Adobe Flash, and for some days I had to manually set the User Agent string. Today, all in a sudden, I started to see the videos on Youtube even when I left the User Agent string set to the default value ("Automatically Choosen"). – kiamlaluno Feb 24 '11 at 21:16

Are you using flash or html5 youtube?

I recommend to try the html5 version, if you are not using it already.

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Could it be that Adobe Flash has crashed? Are you running the latest version?

Also in this time have you restarted Safari/your Mac? If not that may get Flash working again.

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I reset the Mac, installed the latest version of the Flash plug-in, but I still cannot see Youtube videos. I don't have any problems watching the Flash animations that are in the Adobe Flash page. – kiamlaluno Feb 20 '11 at 22:17
Actually, sometimes I need to change the User Agent string, and sometimes I don't need to do it. I still have to understand I have to change the User Agent string the second time I access Youtube, or if that depends from the video being watched. – kiamlaluno Feb 24 '11 at 22:02
If Flash had crashed he would have seen the crash dialog. – Spiff Mar 3 '11 at 15:56

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