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Spent a good 20+ minutes but couldn't find the setting that 'fixes' the UCS to one solid point.
I'm having an issue with my UCS 'dynamically' changing when I try to draw a rectangle near another 3D object. The 3D object is slightly out of alignment. The rectangle is drawn on that objects UCS coordinates. If you want to reproduce this, draw a rectangle, rotate it 0.05 degrees, extrude it, then draw another rectangle over or near the object. The rectangle will grab the extrusions UCS coordinates and also be slightly out of alignment.