Just a small problem that happens every time i start up. Don't worry if can't be fixed, if I just disable shadow, then enable again, its gone. Slightly annoying...

Just a small problem that happens every time i start up. Don't worry if can't be fixed, if I just disable shadow, then enable again, its gone. Slightly annoying...

This often happens when windows close themselves or the makeup of the window is not like a conventional window. (i would asume)
I used to get the problem with Bit Comet.
It happens when a program is opened then minimizes.
Check to see what programs open when you turn on your computer (Start > Run > "msconfig")
and maybe one of those is what shows the shadow.