In some drawings, stretching lines using grip-edit in a plain 2D drawing can result to displaying a rotated UCS at the give node (grip) and any attempt to stretch gives unexpected results when using e.g. the ortho mode (F8) - see:
This is caused by improper setting of the object plane defined by its extrusion vector (normal, DXF code 210). Instead of a standard normal direction [0,0,1], such entity has e.g. a normal vector of [-0.0000056,0.0000071,1.0]. This imprecise value can be caused e.g by wrong drawing plane (not exact plan-view), by rotating the drawing in 3D, or by importing CAD data to your DWG from a non-AutoCAD software. Usually, such entity has also a non-zero (and almost-zero) elevation.
The problem can be solved by the utility CADstudio Reset210. This tool resets the normal vectors of selected objects to the standard value of (0,0,1). Warning, use this utility carefully, unintended changes of normal vectors may result to changes of the drawing geometry!
You can download the free add-on application Reset210 from www.cadstudio.cz/download, load it with APPLOAD and run the command RESET210. You can reset either all selected entities, or only those entities with normal vector is similar to the standard value (0,0,1) with a given tolerance.
Fixing the normal vector will fix also the problem of grip-editing (stretch).
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