Hi Burr, yeah that's actually the _non_ sharp cornered kind of case.

You've got 2 surfaces here joined together:



And check out this edge for example where they join:




The 2 surfaces are completely smooth to one another at that joined edge rather than touching each other at a sharp edge. That can cause additional difficulties.

You can actually get it to work in this case for Direction = Outwards if you use Edit > Separate to break that surface into an individual part rather than having it smoothly connected to the other piece.

I will actually take a closer look at this case though, because the Inset command is supposed to make an attempt to use the surface as an individual part automatically and ignore the connections to neighboring surfaces if it was having problems with the offset.

- Michael