cant get all the catalogs to load in LR4
I'm not aware of LR ever being able to open more than one catalog at a time, but then I've never tried to do that.
But why would you want to open more than one at a time? Come to that, why do you want more than one catalog? Is it to separate business from private, or to separate different clients?
Unless you have a strong need to maintain bullet-proof firewalls between different areas of work, in general there's much more benefit from having a single catalog.