Hi Ronald, thanks for making the screencap movie.
What's happening there is that your mouse is tracking along the construction plane grid. Then you're shifting the view so you're viewing that plane at a pronounced angle, that means that much of the grid plane is way off in the horizon a long distance away. If you then move your mouse towards that horizon line that will result in points that are a pretty long distance away.
If you don't want that to happen, you will probably want to be looking at a more downwards angle at the construction plane when working in the 3D view rather than at such a glancing angle to it, or also you can change the construction plane, if you want to edit things in a more vertical direction in the 3D view set the construction plane to be vertically oriented instead.
You can change the construction plane using the View > CPlane command, also see here for some shortcuts you can set up:
http://moi3d.com/forum/index.php?webtag=MOI&msg=2168.17
Another thing you can try is to switch the 3D view projection from perspective to a parallel projection instead, you can do that under Options > View > 3D view projection. Perspective projections have that kind of pronounced foreshortening with a far off horizon line in them.
- Michael
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