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The missing avatar issue in the small world main profile page is solved.
The firebug script trace showed that the avatar is found by the script (you can even mouse over the traced script line and see the image, cool) when loading the smallworld profile page. But the script also showed a height of 0 and a width of 0 so it doesn't display. Here is a snippet of the line as displayed by FB:
#smallworld_user_img { text-align:center; }
It had no size info so it was changed to
#smallworld_user_img { text-align:center; height:120px; width:120px; }
After adding the height and width parameters, the avatar displays just fine.