Hi all,
Reading through the postings, I figured you might be interested to know in my personal experience with this problem.
I have a MacBook Pro 13 inch, early 2011 model. Unlike previous users, I have only noticed the crash while using Flash player with an external monitor. I normally connect the computer to one of two external monitors -- one at work and one at home. The one at home is a 20" Acer with max res of 1600x900. The one at home is a 23" ASUS monitor with 1920x1080. So far my computer has crashed only while using the ASUS monitor at home, but I watch more streaming content at home than at work so it could just be that. In any case I get the same thing -- external monitor screen goes totally black and when I disconnect it, the laptop screen is black and the computer cannot be awoken. Hard shutdown and restart necessary.
I had the ASUS before I upgraded to Lion, and did not notice a single crash while running Snow Leopard. So I am inclined to believe this is a software problem.
Many of you mentioned that the gfx thing worked ok, but here's the thing: my newer Mac does not have an NVIDIA graphics card. It has the Intel HD integrated graphics. This fact makes it even more convincing to me that this is an Apple software issue, not a hardware or 3rd party software issue.
This seems like a problem with how Lion handles high quality streaming content from Flash and its own integrated video hardware at high resolution. Another interesting side note: my computer has never crashed while using Netflix's online streaming, even in HD. So at least for me it looks like a Flash-Lion integration issue.
I am not a developer or computer scientist, so let me know if anything I said is blatantly false.
Thanks!
-Kevin