Why does my phone take a "screen picture" everytime I unlock the phone?
It has been happening to me since update also. More often seems to happen when I unlock the phone shortly after the screen times out or if I accidently lock it then unlock. It flashes a quick view of the last screen prior to locking then to the unlock screen. Haven't noticed it if the phone has had time to truly cycle into lock status.
Pressing the back + home buttons take screen pics. Not sure how but there've been several people on Charge Forums who have noticed this so I wonder if it became "more sensitive" with the update. But simply unlocking your phone screen shouldn't make that happen...not sure about a fix for that. But with some of the problems people have been having after the OTA we are recommending you call Verizon with the problem. They log it and keep track of common issues so they can (hopefully) address problems.
"I have not failed, I've just found 10,000 ways that don't work." -Thomas Edison