I completely misdiagnosed the trouble. My fault: I should have looked at ~/.sugar/default/logs/shell.log sooner.
I had previously uncommented the TriangleLayout in favoritesview.py. The, in my Favorites view I selected the triangle as my preferred view. When I did an apt-get upgrade (or maybe a dist-upgrade, I forget), it overwrote the favoritesview.py file. Sugar tried to find a triangle layout and could not because it was commented out in the newer version. (I also replaced the computer-xo icon with my-icon in myicon.py and had to reset that again after the upgrade as well.) Sorry for the confusion. I'm posting this to the bug tracker as well. P.S. Should Sugar attempt to fall back to the ring layout if it gets something weird like that? Or give some sort of feedback other than the shell.log?
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