If I get some time I will start from scratch to see if the same happens again.

@hansmex : I have checked and it is not.

@santbose: I have sent you a private email with my file. Sorry for the size. I had not realised it could be so big until after I sent it

Hello,

By following several tutorial I have managed to create the ground floor of my house and was very happy with it.

Now I am on to design the first floor. Now that I have done that I foind out that I can no longer edit the ground floor.

If I click on the level0 tab I can't select anything. I ...