Guys, thank you very much, yes hidden section planes !! duh.

Hi everyone, I have been using Sketchup for a few weeks now and I am stuck with an issue. I have a model (house design) which is located to the right of the green axis (blue is up, red is right). When I try create a line, rectangle etc on the left side of the green axis, it does not show, and only allows me to draw on the 'model side' of the green axis. When I open up a new file and try, there is of course no restriction, or even for that matter early revisions of my house model. I have therefore done something along the way recently, but have no idea what..

thanks, Adam.