Hi. New to both Draftsight and drafting generally, so sorry if a little ignorant. 

First I draft a rectangle on page approx 60" x 60"

With Polar Tracking, Esnap and  Etrack on, and in the LINE command,  I hover over top right corner and the snap comes up, as does the etrack lines. If I move to the horizontal left slightly with Etrack line still enabled,  and then type 30" in order to start a line 30" from the corner, the line starts from the actual corner and not 30" to the left. If I do  this same operation to the right, (ie. to the right of the rectangle) it works fine. Is there a problem with Etrack or am I doing something incorrectly? Even if I enter -30" (as moving to the left), it still makes no difference.

Many thanks for any help.

Graham