Hm ...
Is your 3D working?
Sounds like a faulty part/slab, or ArchiCAD running out of memory.
Do you have vectorial hatching and shadows in the elevation?
Is everything that is not visible in elevation on layers that are off?
Can you post a screen shot of that elevation?
Djordje
ArchiCAD since 4.55 ... 1995
HP Omen