objects disappear when rendered I am having a issue when rendering using cycles, objects disappear and black blocks seem to overlay parts of my textures. this seems to happen at various different angles when the camera is moved around the scene.

Screenshots of material and rendered attached.

Any help would be massively appreciated.
I'm not quite sure why this causes a problem, but this happens because your 'floor' object is scaled to 0 on the 'Z' axis. Selecting the 'floor' and doing Ctrl+A> Scale will 'apply' the scale, which resets the current scale back to 1 but doesn't change the object appearance.

You can see a detailed explanation of the difference between scaling in edit mode vs object mode here.