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

If I install the beta, can I just update to the 'final' version afterwards?

I experiencing the same problems. I have never had my Macbook completely freeze up before. In the past an app would freeze and I just restarted the app. In this case, however, the only thing that works is the mouse.

Ok we are off to a good start 10.7.2 fixes the problem with itunes killing OpenGL performance.

For the 4 days after installing 10.7.2, I did not experience another freeze of the kind most describe here (frozen display, moving mouse cursor).

BUT, I did run into trouble with JDownloader, which requires Java.  While downloading links, my display switched off, and I couldn't get it to come back.  HARD RESET!  Ran Jdownloader again, everything in the display vanished leaving only an empty gray-colored desktop.  Mouse and keyboard unresponsive.  Not even a cursur to move.

Is anyone else running 10.7.2 AND Jdownloader? 

same here, machine only a week old, my first mac experience. not impressed

I'm having the same issues. It's not even when playing video. I'll have iTunes running in the background, and i'll be browsing a real simple site like reddit and it just freezes, with mouse move, and iTunes still keeps playing.... $2000 4 day old iMac... NOT impressed f7u12

I hear that Apple are giving refunds to those that are disattisfied with their new Software and hardware,

Sale of Goods Act - Fit for purpose.

mines only 3 weeks old. not like apple. never had any of these problems before.

I just purchased my first iMac less than a week ago. Like all other previous posters, I too am experiencing video crashing issues when watching videos. I have the same symptoms - everything freezes except the mouse. The only way to recover is to power down and restart this machine. This is a major bug in the OS; very uncharacteristic of Apple.

Please fix this Apple (and soon). 

Same problem. 2 weeks old iMac with Lion. Funny. Changed to a Mac because grew tired of Windows being unstable.

same problem! Base model iMac ($1199). hope it gets fixed soon, cuz i love this machine!

I am having the same problem too with 27' iMac after installing Lion. It is our first Mac and we are very dissapointed, especially that the main reason we bought this iMac is for video playback/editing.

I hope Apple will respond soon with a fix and an apology and/or credit to affected consumers, otherwise they're not much different that Microsoft.

I also have the problem here in Germany.

I bought my iMac two days ago and did the upgrade and then there was the problem

Sorry for my Englisch, i'm german

My iMac is the higher 27" with standart configuration (3,1ghz i5 and 1GB 6970M )

Please, Apple, fix it!

Until that I turn Flash off and Youtube to HTML 5

Same problem here. New 27" 3.4 GHz Intel Core i7 iMac freezing upon video playback after waking from sleep mode. Definitely a bug with Lion. Apple needs to fix this soon, very frustrating!

Add me to the list: running Lion on a Mid-2011 21" i5 iMac. Everything works fine and stable if I don't put the machine to sleep. After a sleep cycle all types of video freezes the OS with only the mouse cursor remaining active.

This doesn't happen each and every time I play video after a sleep cycle, but I'd say it happens about 75 % of the time. It NEVER happens if the machine hasn't been sleeping since last reboot.