I'm experiencing the same error & I might take it into apple and see if they are willing to play ball since I have at least four open cases with them at this point for various issues. Some confirmed software, the jury is still out on the others.
What I did and what others who think they are free and clear of the issue is to follow the same steps as above but manually trigger the switch to the 4XX graphics card. You can do that in the energy saver preferences and checking or unchecking the box at the top of the screen. When I unchecked it and forced it to use the 460 card then it gave me the error/screen glitches. Also from casual observation it's only an issue when you have certain apps open and then make the switch. If you have it already on the 460 card it won't be an issue unless you switch it down or vice versa.
To me this smacks of a software issue. Since I can't replicate it without having either (or both) iPhotos open & the Siri window activated. I'm still going to call Apple later tonight and add this to my graphics complaint and send them a video if they so desire. For the record I'm also running the latest Beta.
Why not just get a replacement ? You can wait for the next software update next week I believe, but you have till 8th Jan to return it, since the machines are delivered after 10th November they fall under extended returns, I have transcript from 2 AppleCare employees confirming this , if there are issues with the return I'll dig them up, looks like an online error from Apple saying we have 2 weeks
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I see thanks. so I guess in my case it will be the usual 14 days return period. I will just hope the issue will be fixed by Jan.
The policy is clear, the Apple online is incorrect. You have till 8th, it's received and not ordered. The Apple returns are always from received , otherwise a preorder makes is non existent , even payment was after the 10th November