I would guess that "Snap to Grid" is/was off when the line was created.
Other solutions could be:
- you are specifying an exact distance for the line that is a fraction of an inch
- you specify an absolute (or even relative) position to start/end the line which is in a fraction of an inch
- moving the line by arrow keys is set to move the objects in 'grid incraments'.
- if you are just grabbing an arbatory point (or center point on the object with "snap to grid" on, then it will jump along to the next grid point when moving.
- snap points on a line (end points, mid points, nearest...) will over-rule grid snapping, so if the line is 1" long and a line was snapped to it's mid point, then you have created the start point of that line on a 0.5" interval.
Hope this helps
Gadget