Hi, I've been following this thread for a long time, and I thought I'd share my experience with this latest 1.60 update on my M60 since I haven't seen this mentioned before.
Obviously, Vizio is aware of the problem, and I got offered to have the mother board replaced. I was assured that it would contain the latest 1.60 update on it. When the part came in, I tried to confirm it had the latest update, and the man at ITI said there is no way for him to know until he gets it into the TV. So I called Vizio to confirm again it would contain the latest update, and that they weren't just opening up my TV to roll the version back to 1.34. They couldn't confirm the software version, so I replied I'd rather not have the new motherboard installed. At that point another customer service guy got on the phone and said they are aware of the problem, and a fix for 1.60 is being rolled out, but how didn't know how fast the process would take. The interesting part is, he mentioned that even though the fix is being rolled out, there is no guarantee it will work because there may have been damage to the motherboard with the 1.60 rollout and these problems can't be undone. So, though it would have been cheaper for me to just wait for the fix for 1.60 to roll out, he recommended I should just get the board replaced so there will be no problems when the new update comes out.
I'm not familiar with how all this stuff works, or if damaging the motherboard with an update is feasible, but he did mention that these TV's are very sensitive, and is unlike updating software on a computer. Hope this all makes sense.