Q: OSX Lion + 2011 iMac 27'' + Video = Freeze

Sorry to hear this bro.

I had no freezes since 10.7.1 on my mid 2011 iMac (21,5" i5 4gb - lowest model), so I'm OK i guess.

BUT what I don't understand is that Apple doesn't make an official statement!!!

It is also not mentionned in the HT : http://support.apple.com/kb/HT4764

So officially it isn't solved I think or it is totally ignored by Apple. (I had NO reaction on my mail to Apple!!)

Many DJ's use their mac to perform live: what if it hangs??

Or if you give a presentation,...

I wouldn't use Lion professionaly...

Same kind of problem on my iMac 27" i7 3,4Ghz 6970 1Go :/

Yep, I've seen that one too. The green static seems to be the most persistant. W T F is Apple doing? So disappointed. Took them over a month to release 10.7.1 and they are breaking our machines with this GPU glitch/overheating.

Seriously, I just purchased a 2nd 27" iMac for $3k and I shouldn't have to deal with this crap.  I can understand if I upgraded to Lion but Lion is preinstalled.

Yet another one for the list. I think I've recently figured out that this is being triggered by attempting to play HD video with Flash on YouTube or anywhere else. Within minutes of playing anything with HD in Flash the corruption begins and things deteriorate until a reboot. Interestingly, I regularly have mutiple user ID's logged in concurrently and when this happens it impacts both User ID's at the same time

iMac 27" (2011), 3.4GHz i7, 16GB RAM, 2GB Graphics Card

Yeah, I think it is triggered by HD video because that's when I start seeing the artifcating.

And my GPU temp can get to the 80s (celsius) and the fans don't go any faster.

I'm getting the same kind of problems.

What happens is I run a video in iTunes, notice that it's being flickery, and then I can go to Dashboard and it's trashed.

Once it starts screwing up, other areas of the GUI are also affected.

I've seen it mess with shadows, the doc, the title bar, etc.

Logging out and logging back in corrects the problem.

3.4Ghz i7, 16GB Crucial RAM,

AMD Radeon HD 6970M 2048 MB

256GB SSD+2TB HDD.

Please open a new thread.

The problem reported here has been solved with the latest update 10.7.1.

I7, Apple 4G RAM, 2G Radeo HD, 1TB HDD

That's kinda my point; the problem is not solved in 10.7.1.

The freezing problem has been solved for me but not the artifacting issues.

I don't know about anyone else, but my freezing problem seems to have started just in the last few days.  I'm running 10.7.1, and I've had many hard restarts and two kernel panics with autoreboot just in the last day.  I'm considering putting my old desktop from 2005 back in service until this problem is reparied.  I've never had to force restart my Apple so many times before.

My problem seems similar, but the mouse is sometimes unresponsive as well.  There will be moments of clarity, where I can click and see the seconds tick over on the clock, but the video playing seems to refresh a few moments after the seconds start ticking.  I do hope this is addressed soon...

Interestingly, I haven't noticed this problem on my laptop running the same OS.  The only thing odd it's done is the background has changed itself to simple black for no apparent reason.

Same issues with sleep and video.

I'm truly disappointed with a machine rated at 3,000€

I understand that the problem is software, but in practice it doesn't matter, I bought a super machine and can't use it as expected/announced.

Hardware Overview:

  Model Name:                    iMac

  Model Identifier:               iMac12,2

  Processor Name:               Intel Core i7

  Processor Speed:               3,4 GHz

  Number of Processors:          1

  Total Number of Cores:          4

  L2 Cache (per Core):          256 KB

  L3 Cache:          8 MB

  Memory:          8 GB

  Boot ROM Version:          IM121.0047.B0A

  SMC Version (system):          1.72f2

  GPU:                                AMD Radeon HD 6970M 1GB

I, too, purchased an IMAC 27" from Best Buy in May 2011, and installed Lion, instant problems, video freezing, Firefox and Skype would not work - deleted Firefox, Skype, installed patch 10.7.1, and latest (beta) adobe flash - running smooth - knock on wood.  My gut instinct is that not being able to use Firefox or Skype was 'by design', that Mac is trying to get its users to only use Mac products (they are known for this) - Facetime and Safari in this case.  Safari is garbage - don't know about Facetime.  This was my first (and last) Mac computer I will buy - par for the course in terms of more junk in my house from Best Buy.

@gamblinfever. Try Google Chrome if you don't like Safari. I also only purchased my Mac recently and had the freezing issues until 10.7.1 was issued. Had no issues since and Chrome works pretty well.