PCF's that have been made by importing a CCF have been causing a lot of these problems. From 6 PCF's that people have sent me that had problems all were traced to... Buttons or panels that had a dimension that put it outside the 240 by 320 screen size. Buttons or panels on the left side of the screen that had a position of -1 or less ( this needs to be a positive number of 0 to 240). Also buttons or panels on the right side of the screen where the position plus the dimension width total is greater than 240. I have not yet found any with top or bottom errors.
Once these errors were corrected the simulator ran with very few lock ups and the double images were gone when going from page to page.