Came across yet another strange issue while modelling in Blender, and I've created a seperate thread about it, because it's unrelated to the other threads, which may very well just be my lack of workflow understanding.  But this one seems to be a bug?  It has to do with creating simple insets.  Here's what I'm doing.  I created a box, which will be subdivided.  So I added a subdivision modifier to the object level, then went into edit mode to work on the box.  I added some support edges to the box to give it some shape.  I also added a segment straight down the center on the X and Z axis.  You can see my edge loops in the cage of the screencap.

Next, I select 4 faces at the top of the box, and choose inset.  I inset by percentage or absolute (it doesn't matter), with region selected.  What I end up with is an inset that contains some strange triangulated edges (indicated in red below):

Now, to give an example of what I "expected" to happen here, I did the same kind of model in 3dsmax, with the same edge loop configuration, and a subdivision modifier at the top of the stack.  I went into "edit poly" to work on the faces, and did the same inset procedure. This time, in 3dsmax, I end up with a group of cleanly inset quads.  No triangulated edges, as expected:

So my question is, what's going on here?  Is this a bug?  I'm using Blender 2.72 (latest stable version) on Windows 8.1.  I tried removing the "region" option, but that just insets by face, which I expect.  That result is clean and fine, but not what I want.  I could use extrude for this, and just extrude with no height, and scale the faces in, but why, when there's an inset feature right there?  Can anyone else reproduce this strange behavior?

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Tools :  3dsmax 2015, Daz Studio 4.6, PoserPro 2012, Blender v2.74

System: Pentium QuadCore i7, under Win 8, GeForce GTX 780 / 2GB GPU.