Flash player won't work

Adobe are being very slow to update their applications, including Flash Player, for Lion:

http://www.macworld.co.uk/news/index.cfm?olo=email&NewsID=3293104

http://www.macworld.co.uk/news/index.cfm?olo=email&NewsID=3293106

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If I have the enable plug-ins box deselected and go to youtube, videos don't load and it says I have to upgrade my Adobe Flash Player (although it is up to date

That box must be "selected" in order for the Flash plugin to be available to stream YouTube content.

Try this...

Quit Safari. Open a Finder window select your Home folder in the Sidebar on the left. Then open the Library folder, then the Caches folder, then the com.apple.Safari folder. Move the cache.db file from the com.apple.Safari folder to the Trash. Relaunch Safari. Try a video.

This is my work computer, where I'm set up as a user and don't have access to the admin login because my IT guy is out on vacation.

The network admin may have permissions setup so you can't add or remove certain types of content.

I am having the same problem, but I don't think Flash is to blame. It is happening on one of my sites which uses JWPlayer to auto play a video on page load, but in html5, not Flash. In Safari 5.0.5, the page loads fine and the video autoplays. In Safari 5.1, loading the page causes the browser to refresh three or four times in a second (i.e. as fast as it possibly can) and then it throws the error "Safari has repeatedly encountered an error while trying to display http://www.irbpassport.com"

However... when I go into the source code and remove the autoplay parameter, the page loads fine, and it is only when I click to play that the refreshing and error occur.

I therefore suspect an incompatibility between Safari 5.1 and JWPlayer. I'd be interested to know if JWPlayer is a factor in anyone else's situation.

What's the OS on your work Mac? Snow Leopard? I am having these problems on Snow Leopard. If you are too, then perhaps this is a problem specific to Safari 5.1 under Snow Leopard, which does not exhibit itself on Safari 5.1 under Lion?

I simply wish I hadn't upgraded. Safari 5.0.5 was fine. I only really do it so that Software Update doesn't nag me. I shouldn't imagine there's a way to downgrade either.

I'm having the same problem on Snow Lepard. All I did was a program update and now anything that has video I can't watch. I've also noticed alot of errors with Safari to where it can't find the browser for a website. And CS5 seems to be running a litte funny. If anyone finds out how I can fix Safari let me know!

Your problem may not be exactly the same as that of the original poster of this thread, and it can be very confusing for everybody if we try to answer more than one question in each thread.

In order for us to give your problem our undivided attention in order to try to solve it, would you kindly start your own thread, describing the trouble you are having in the fullest detail, including completing your details to show what Mac you are using, what operating system, and what version of the application in question.

Also, what 'program update' it was you installed.

System info: MacBook Pro, Safari 5.1, Flash 10.3, Snow Leopard, Click to Flash.

I don't know if this will address your problem, but Flash stopped working in all browsers (I don't know if it was associated with some upgrade, or some other event.) Took a while to find the answer, but it was in a Flash setting (I access the Flash settings by a right-click on any Flash video) that was causing the problem. Local storage (the folder icon in the settings window) for Flash was set to zero. I unchecked "Never Ask Again" and set storage to unlimited. Problem fixed. (I didn't check to see if some lesser level of storage would work, but suspect that it would.)