Just a quick question... your maximization limit (the orange line) is all the way to the right- is this what you intend?
(If you move it to the left and give more room on the right side and load icons, do they show up?)
You can also go under the WINDOW menu and reset the maximization limit. (The area to the right of this line is dedicated icon space... which on your current screen is unavailable for icons!)
If I am correct... your Process Control window would show that you *did* load the icons successfully.
-adam
P.S. I just reproduced the behavior. A suggestion for the maximization limit behavior could be that if no icons fit in the maximization area- it either automatically expands the desktop or moves the line to the left... or maybe just makes the ML blink to let the user know there are "hidden" icons.