Hi Bob - are you doing the drawing in the 3D viewport or in one of the 2D top/front/right viewports?
The behavior of drawing on surfaces is different depending on which of these kinds of viewports you are in - when you're in the 3D viewport it's assumed that you are doing more freeform drawing and that you want drawn objects to conform to the plane you are snapping onto. When you're in a 2D viewport (top/front/right) it's assumed that you are focusing more on 2D drawing in that view and that you want objects to align to that view's plane rather than the snapped plane.
Does that explain the difference you're seeing?
Also the "On surface" object snap by default is not active in 2D views, because surfaces cover a large area of the screen and would prevent accurate 2D planar drawing when you're in a 2D viewport (see here for an explanation: http://moi3d.com/forum/index.php?webtag=MOI&msg=2267.2). You can adjust this by a setting in moi.ini under:
[Drawing Aids]
DisableOnSrfInOrtho=n
re:
> I'm attaching two screen shots showing the same attempt at drawing a rectangle with the snaps specified.
In that screenshot it looks like you're drawing in the Left viewport, so that is normal that you'd get viewport grid-plane aligned drawing behavior there.
If you take another look at the video above ( http://moi3d.com/forum/index.php?webtag=MOI&msg=7692.6) you'll notice that when I'm drawing there I'm picking those points in the 3D view to get "align to object's plane" type behavior instead.
Hope this helps explain things.
- Michael
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