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

I managed to cure the issue by turning the computer Sleep setting in Energy Saver to "Never" since then I haven't had one freeze, and have been able to play all different types of Videos on the net including Youtube.

It's been a week since i decided to turn sleep off and so far i haven't had any problems whatsoever.

If this was really annoying you, like it was with me then i highly recommend turning sleep off as a temporary solution until Apple release an update.

have you a same problem with Flash 11 beta for Lion?

Flash 11 Beta does not fix the problem. This is NOT a Flash problem! It is a Lion problem.

Hi

I have the same problem. After I wake my imac, if I try and run a flash video, it freezes. This both in Safari and Firefox.

ATTENTION: I have put my iMac in a no sleep state for the past few hours. Since I have disabled the sleeping mode I have NOT had any problems with viewing videos of any type on my iMac. This seems to have done the trick for now, in till Apple releases a software update of some type.

YES.  NO SLEEP IS GOOD WORKAROUND.

I have been working for 3 days now. Edit video upload, test, etc. No freezes. Lion + iMac i7.

Much easier to do this than downgrade to SL.

All, I have a 2011 27" iMac.  After upgrading to Lion, I have been having the same problems (mostly with playing video in iTunes, although it crashed once with Safari).  What typically happens with iTunes is that a movie will start playing, there is sound, but the screen is black.  The mouse icon can move, but it will not do anything.  Have to do a hard restart.

I've been on the phone with Apple Support for a week, and it has been with Apple doing hardware stress tests (it actually had a kernel panic when it was at Apple).  They confirmed that they hardware is fine, and it's definitely a Lion issue.  I was told the engineers know about the issue and are supposedly creating a fix.  Whether or not they actually are looking into this is another thing.

So much for paying a premium for an "uncrashable" computer!  Macs aren't supposed to crash, Apple!

When Apple  releases 10.7.1?

SL 10.6.1 is released after 10 days

No sleep is good workaround, but I've still got some artifacs watching a lot of 3d tutorial with quicktime.

What happened with your customer's Mac? You told me you were going to report in another thread.

Please disregard,I have you mixed up with another Mac User whose name is similar to yours.

talked to applecare, told me to instal current verison of flash rather than beta version, obviously didn't help!! They admitted that there may be a problem but had no information. i really think that they should be aware of huge threads like this. Anyway, switched sleep to 'never' and I turn the iMac of at night. Seems to have solved the problem for me and not a big deal really. I have never had the 'artfacts' that have been mentioned here and no problems in Itunes or any other video other than embedded videos in websites, so there may be more than one problem here. over and out for now

First time Mac owner chiming in with the same issue. Baseline 2011 iMac 27-inch with 2.7GHz i5 and 4GB of RAM. Freezes at least twice per day on Lion. Insanely frustrating.

Love the OS since I switched, but the freezing is ridiculous.

I had the same issue , Install fresh copy of Lion OS X and the problem gone.

I hope it work with you.

Yes, I am having exactly the same    issue. Upgraded a new 27" imac from Snow Leopard to Lion (10.7)  and have had these freezes every few days. The mouse (or, in my case, trackpad) cursor works, but that's it. Nothing is clickable and the keyboard is dead. Only way out is to power down. Happens intermittently when in Safari. VERY irritating.