Looking at your screen shot it does not appear promising. The Masters folder as well as the Previews, Thumbnails and others are reporting there size as 0 bytes, basically empty. Were the masters in this library referenced?
You say this is a library from 2009 but that it was a 3.4.5 library, how can that be? 3.4.5 is a fairly recent release. Did you open and upgrade this library at some point before trying to open it now?
Message was edited by: Frank Caggiano - BTW is this related to your other thread on the library size discrepancy between copied Aperture libraries?
in a way it is related to the discrepancy but after talking to Apple I've decided not to freak out about it = in fact, when I was checking another drive I found the same Aplibrary ref 2009 and it had 100+ G in it == so apparently the 'little' one is a corrupted one == the big one is fine apparently and I'm feeling much better == thanks for the info in any event