Ap, (Aperture) has the option, like many application of holding down different keys at launch to bring up alternative menus. This link describes some of the trouble shooting steps for Ap.
http://support.apple.com/kb/HT3805
Also worth running on as regular basis, weekly, are the tools in Disc Utility.
RB has some great reading and links on his site about workflows and set up for Ap, well worth spending some time sifting through finding what is relevant for where you are at just now.
http://photo.rwboyer.com/
Me I have separate libraries for major genres, corporate, sport, family.
within Corporate I have:
client folder/year folder/specific shoot* project/albums
*A shoot will be a max of a day, if the shoot goes out over a day it will typically have its own project
I run a library on my MacBookPro that I use as a temp repository whilst on location and for other bits.
My main library is starting to get a little unwieldy and with Ap now allow for easy library switching I am tossing around the idea of having a separate library for each client.
HTH
Tony