I have got the same system installed, summer update included and just checked it works correctly. Something related to MS C++ Redistributable 2010 package? I remember some troubles around the fbx importer solved by reinstalling it.
, I think you're on to something. I just noticed that even with obj import I don't get an import screen, could that possibly be the reason why the whole fbx importing does not work?
I tried reinstalling the 2010 Redistributable but it is not fixed yet but I think it might be something related (some other old package or such).
