After reading chriscantrell07 posts I tried something. I don't use a password on my desktop but I like the pre anniversity update screen on startup of the window picture and round picture of me. After anniversity update using lockscreen startup option I tried to get it back. I did but over half the time on startup I got a solid color screen with the picture. No apparent reason why. I also used the Windows 7 menu like chriscantrell07. When I switched to Modern menu as he did, startup is as I wanted. It hasn't messed up in two days and I purposely did many restarts to see if it would. If you have an odd problem try changing menu.