Hi all, I'm having a problem on one seat of SW16. I'm adding a large center mark to isometric views manually. When I try to add a midpoint relation between two lines, I select just the midpoint of one line and both the midpoint and the line are selected. I then try to select the next line and use a midpoint relation and it won't work because I have two lines selected.

I know I can work-around by deleting the first line from the selection list, but its only happening on one workstation. Is there an option that I have turned on/off?