Hey there,
Not getting into the details, but we recently bought a laptop that has Windows 8 preinstalled, and since the office still works with Archicad 11 we had to install it as well. The problem is that the plan view of the objects, in the Library tab, is blank. The section, perspective view etc is normal, but in plan you cannot see the object. And by plan view, I mean the object representation in the small display window from the library features where you can set the preferences for the object.
As a first step I reinstalled an older version of quicktime, as well as the NET framework 3.5. It still doesn't work. Any ideas?