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My sense is that there is more than one issue here since people’s experiences and set ups seem to differ. I have 2006 MBP + ACD and have experienced these freezes intermittently for some months on SL (freeze of screens except for mouse, but sometime with the screens just going black and everything freezing.) I had hoped that Lion would cure this but it seemed to make it worse so I was getting 2 or 3 a day. In my case it did not seem to be particularly video related and could happen anytime and sometimes seemed to be brought about by a mis-keying. I followed nanofunk’s post and external links on this and installed Flash 11 beta and it does seem to have made a difference. In 3 days I’ve just had one freeze when I had a lot of QT windows open, but this time I got an automatic restart as a result, which I’d never got before even though I’d set the Energy Saver preference for this. Not suggesting that this will solve everyone’s problem, but so far the Flash 11 beta seems to have done it for me.
 
I was wondering if this was a Lion bug, wouldn't it at least affect all 2011 iMacs that have Lion preinstalled?
 
Comment deleted, because it no longer represents my current view on subject.
 
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Lion ate my Rosetta Stone

Ah, maybe that's what happened (Flash) to me with Rosetta Stone. Working normally after Lion installed except last night. Program open, I walked away to do some things, came back and screen black. Wouldn't open. Wouldn't reboot. After keeping power button down for linger than usual time, screen came up "Fatal Program Error".
 
Just so you know i'm still not getting this issue. :confused:

2010 iMac i3 (bottom line)
Lion install was an upgrade.
 
I have the same iMac, but with 4 gb RAM. I get the same behaviour with online videos, and even in iTunes and iPhoto videos.

Same problem here.

2011 iMac 21.5", BTO 2.8GHz i7, 12GB RAM, 1TB HD, Lion 10.7 (upgrade from SL).

From a fresh power cycle, everything behaves as it should. The problem will only occur once the machine has been woken from sleep mode.

Playing any video content once the machine wakes from sleep will cause a complete freeze of all UI elements apart from the mouse pointer. I can move the pointer, but cannot interact with anything (menus, Dock, nothing). The iMac will also not respond to any keyboard input. Holding down power for 5 seconds is the only solution I've found.

Music will continue to play in the background, as will the audio track to whichever video file caused the UI to freeze.

I do not believe this is a Flash issue. My iMac behaves like this for any video content (played in iTunes, from Finder, etc), occurs if I attempt to play HTML5 video content in place of Flash video in the browser, occurs irrespective of the version of Flash installed (including the beta 11 64-bit release) and even occurs if I completely uninstall Flash.

Never experienced anything like this in Snow Leopard so it's definitely new for Lion.

I would guess this is a video driver issue specific to the latest iMacs related to sleep mode.

-Dan
 
I think could be because now Apple no longer distributes Flash and is now up to Adobe to do it maybe that is there is a problem?

So far, putting the Mac to sleep does cause such a problem, however, now i am trying to do a log out, then put it to sleep and so far, not yet seeing it. Hoping for the best. In any case after logging back in you are back where you left off so think its not much of an issue if it temporarily resolves the crash.
 
Apparently, after coming back from sleep state, Lion will freeze when attempting to run flash videos, where only the mouse cursor will move but nothing is clicakble. Cannot access Activity Monitor nor Force Close. The only solution is to hard reset with the power button.

I've experienced this myself multiple times, and so have others. If you're experiencing it too, please report at the provided links to Apple Support.

http://gdgt.com/question/anyone-else-having-flash-video-freeze-their-27-imac-with-lion-f4s/

Hopefully patch/fix is on the way...

EDIT: Report on TUAW: http://www.tuaw.com/2011/07/24/lion-bug-some-imacs-locking-up-after-playing-video/

Think yourself lucky! My copy of Lion (which is the second one I've installed as the first one was completely corrupt) won't even install Flash!

Lion has be an absolute nightmare for me and I don't particularly like/ want any of the new features.

So, why did I buY it then? Because my copy of Snow Leopard was corrupt too and Mac mail was completely unusable! Cheers apple have some more of my money!!
 
No problems with Flash or HTML5 here.

Let me backtrack a bit in my statement; I have been able, indeed, to replicate some of the hard freezes after playing videos...in my case, it already happened a couple of times with EMBEDDED videos, be they Flash or HTML5. The sound continues to play and the mouse cursor moves, but all the rest is frozen and requires a reboot.

I've heard elsewhere that Apple is already aware of the issue, which is NOT Adobe-exclusive but a Lion problem...this will probably be addressed with 10.7.1.
 
It's a 2011 iMac graphics issue....a friend of mine just got one and said it freezes all the time. My Mac Pro, Mac Mini and Macbook Air all run flawlessly!

My 2011 iMac freezes. My 2011 MBP doesn't. But then there is the dreaded battery bug issue with the MBP. I sure hope the update comes soon, and that it fixes both. There is a lot to like about Lion, but . . .
 
Think yourself lucky! My copy of Lion (which is the second one I've installed as the first one was completely corrupt) won't even install Flash!

Lion has be an absolute nightmare for me and I don't particularly like/ want any of the new features.

So, why did I buY it then? Because my copy of Snow Leopard was corrupt too and Mac mail was completely unusable! Cheers apple have some more of my money!!

Sounds like you have a failing hard drive.
 
Let me backtrack a bit in my statement; I have been able, indeed, to replicate some of the hard freezes after playing videos...in my case, it already happened a couple of times with EMBEDDED videos, be they Flash or HTML5. The sound continues to play and the mouse cursor moves, but all the rest is frozen and requires a reboot.

I've heard elsewhere that Apple is already aware of the issue, which is NOT Adobe-exclusive but a Lion problem...this will probably be addressed with 10.7.1.

Yep happens to me watching MLB, the game, on occasion it will just freeze and then after a while start from the begining. Just upgraded to Flash 10.3 and today it didn't freeze.
 
I think could be because now Apple no longer distributes Flash and is now up to Adobe to do it maybe that is there is a problem?

In any case, a user level application such as flash, which is outside the operating system kernel, must never allow a system to freeze.

Even if there are bugs in flash, the freezing is a bug in OSX.

Worst case, the buggy application (flash) should only crash.

It is amazing that apple is not able to fix this severe problem known for over a month.

After considering for 2 months, I was going to order a 27 inch imac tonight, but now that I've learned about this severe problem, I'll have to wait.
 
This is not a Flash bug. It has to be some issue with lower level video frameworks in Lion and the GPUs found in 2011 iMacs, because it affects ALL videos- quicktime, flash, etc. even with a completely clean installation of Lion.

Downgrading to Snow Leopard completely fixes the problem, so it is not exactly a hardware issue either.
 
This is not a Flash bug. It has to be some issue with lower level video frameworks in Lion and the GPUs found in 2011 iMacs, because it affects ALL videos- quicktime, flash, etc. even with a completely clean installation of Lion.

Downgrading to Snow Leopard completely fixes the problem, so it is not exactly a hardware issue either.

Exactly - once more:

- THIS IS NOT A HARDWARE FAULT, although it is seemingly exclusive to iMacs;

- THIS IS NOT FLASH-ONLY - it also happens to HTML5 and other formats/containers;

- THIS MAINLY HAPPENS WITH EMBEDDED VIDEOS but may also occur in other instances where videos are played;

- THE ONLY SOLUTION has to come from Apple, probably through 10.7.1.
 
In any case, a user level application such as flash, which is outside the operating system kernel, must never allow a system to freeze.

A little correction. Should say "A user level application WITHOUT custom kernel extensions".

Anyway, the freeze in this case is definitely an OS bug, mostly in the graphics driver. My 2011 Mac mini is not affected. My MBP 15' 2009 is still on SL.
 
This problem seems to have completely gone away for me since .1 update. Can anyone else confirm this also?
 
not sure if this is the problem i am having or not, but I keep locking up when using firefox or safari and a flash webpage loads


I am using chrome to post this because it seems to be the only browser that doesnt lock my system up


I am on 10.7.2 and none of this happened less than a week ago when I was on snow leopard
 
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