Hi Michael,
I took Marco's file from this post here:
http://moi3d.com/forum/index.php?webtag=MOI&msg=7912.13
And shelled it .1 (He said it failed)
Doing a drilldown selection of that top surface, the success or failure can be achieved by the selection position.
Not sure if that can help you find anything on your end or not.
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