Hi niko,

> Unless I'm doing something wrong it is apparently missing on the latest v3 osx beta...

I just tested it with the latest v3 osx beta and over here it's working ok for me...

Like Burr mentions make sure you have placed the start point of both construction lines snapped on to the very same point.

You also need to have "Straight snap" enabled (turn it on next to Grid snap in the bottom toolbar) in order for it to kick in.

- Michael