Michael.
I'm using the November 2012 release here.
If you extrude the conrod.3dm to (say) 20mm and do an Inset on the top face with the Thickness at 2mm, Direction = inwards, and the other two options unchecked, then no inset happens (for me).
Swapping the Direction setting or ticking the Use separate height feature seems to clear the problem - even if these options are then subsequently reverted.
Just to mention that when I tried Inset for the very first time on this beta, I saw a surface leak through the large hole of the conrod file, but I haven't seen that happen since.
Thanks for all your hard work.
Martin (2).
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