I recently stumbled about some weird behavior when it comes to cutting circular holes into a mesh. Most of the time it doesn't work correctly. Everything starts with a standard cube.

1. NKEY, and change dimX to 4. Loopcut the box into two cubes. Subdivide one so that I can delete the center vertex of the hole. Select the vertices around the hole, put the cursor there, and hit "to sphere" (
2. same as in 1) only that I used scaleX instead of dimX.
3. Manually move the faces along the x-axis either both by 1 or one face by 2 into that direction. Then loopcut, etc.

The resulting mesh looks the same, until I try to cut the hole and make it circular.

1. • 2. The holes on top and on the longer sides become not a circle but an ellipse.
2. The holes are all circles.

Can anybody tell me, where the meshes are different? Must be some difference, otherwise "to sphere" would create circles, no matter how i resized the cube.