BlockTableRecord converting arcs to ellipse

[tjn]

I am attempting to create a BlockTableRecord that contains arcs and circles. Creating the BTR is working great but after I insert a block reference and explode it, all the arcs and circles have been created as ellipses. The code below is what I am using. I have placed a break point where the item gets appended to the BTR and verified that the item is a circle but when everything is finished, it's an ellipse. Anyone know how to fix this? If I run the same code but change the BlockTableRecord to model space, the circles draw fine.

Using AcTrans As Transaction = oAcadTm.StartTransaction
  Using AcBlocks As BlockTable = oAcadDb.BlockTableId.GetObject(OpenMode.ForWrite)
    ''create the new block record....
    block = New BlockTableRecord
    block.Name = blockName
    blockId = AcBlocks.Add(block)
    AcTrans.AddNewlyCreatedDBObject(block, True)
    ''add the entities to the block record....
    For Each item As Entity In entities
      block.AppendEntity(item)
      AcTrans.AddNewlyCreatedDBObject(item, True)
    Next
  End Using
  AcTrans.Commit()
End Using

[chiefbraincloud]

The only way I can think of that that would happen is if the block reference (INSERT) was not scaled uniformly when you exploded it.  If you explode a non-uniformly scaled block containing circular arcs, autocad will replace the arcs with elliptical arcs to maintain the visual appearance of the block reference.

[tjn]

Wow. You know, sometimes it's the little things. The block was *not* uniformly scaled. The X and Y scales were the same but the Z scale factor was set to 1. Thanks for the help.