I'm sure it's a simple problem but I have been able to create a roof by selecting all walls, AEC, create roof etc, however all of a sudden when I now do this and fill in the settings in the roof dialogue box it is unable to make a roof, there is no error message, the dialogue box disappears and no roof is made, and usually one wall is left selected. I have made sure it's not the walls on the building that are the problem by making a standard square wall shape and doing the same but again no roof. I have restarting with no effect. Anyone have any thoughts, perhaps something I have inadvertently changed? Thanks.
