After the 2012 update of CADWorx, one of my designers failed to see the temporary line that AutoCAD draws before completion of the command. I tried suggestions from different discussion forums but nothing worked. Since the lines (or circles or arcs) were being drawn to the correct colors, I thought that the temporary line must be the same color as the background. I changed the color of background and the temporary lines started appearing. With some trials and errors, I managed to find that it is controlled by 'Dynamic Dimension Lines'. Hope this helps somebody!