AutoCAD 2010/2011/2012 DWG Format

[#1]

On previous versions of autocad I used all views to draw lines and rectangles to produce 3d models, but now when i try it they only come up as horizontal lines.

[#2]

Which previous versions can do that?

set it to e.g. SE view, you can,  but not front view.

[#3]

2004 could do it. I was able to draw in all views, extrude the parts (walls, windows etc.), then join them together using an angled view

[#4]

But if you look at front , back.... whatever view UCS icon, it only gives you x and y but no Z

[#5]

In your example look at the UCS, the X and Z are showing, change to an iso view or change the UCS so the X and Y show.

When drawing 3D in AutoCAD it is best to have at least three viewports showing, with one of them in an iso view and the others in a front and right view, or top, etc. so you know for sure where you are drawing in space.