fixed it
It took me a while to find the solution for this, but finally I got rid of this annoying behavior.  
I am very new to windows 7...
 I right clicked the desktop looking for the familiar properties option to get to display settings... and chose personalize.  
In the lower right hand side I selected "Screen Saver".  Under the Power management section, I selected "Change power settings".  I have a Dell, so by default the Dell plan was selected, I changed it to High performance, and then clicked on "Change plan settings". 
I selected "Change advanced power settings", and then clicked on "Change settings that are currently unavailable".  This allowed me to change the Require a password on wakeup option to No.  I then selected Ok and Save changes. 
I no longer get the user screen when my pc wakes up from sleeping.
Someone else posted a similar solution and you mentioned that you had already tried that; I'm not sure if this is the same option or not, the other poster mentioned checking "Don't require" and the option with this method was "No"... 
I hope this helps, it worked for me. 
 
-drumbokas
edit: my user account does not require a password, and I have a guest account that is off.