Return from Screen Saver causes second display application to move

I use a Toshiba Tecra A7-S712 and a second monitor on a stand. The second
monitor is above the laptop monitor, so I set my preferences as such, which
is different from the default where Monitor 2 is to the right.
Problem - When I return after I have locked my display or it has gone into
screen saver mode, the initial view is as I left it, but within the next few
seconds I see 1 to 3 screen flashes (as if it is loading some display
parameter change) and my Outlook on my upper screen has now disappeared.
Using RightClick + Move allows me to move it from some place on the right of
my lower monitor screen back up to the top where I had placed it originally.
Not all of my applications in the upper monitor migrate to this location.
Any ideas how to fix this?