Aperture 2 Freezes on Load

Question

Aperture 2 is freezing (beach ball) on load. Library projects list appears, but nothing else happens.
This problem likely started during an import of the iPhoto Library (as referenced files). During import, a system crash occurred and I was forced to reboot. When I logged in, the system crashed again and I rebooted. Now Aperture gets stuck loading my library.
I have removed the permissions file, removed the Application Support folder for Aperture, re-installed Aperture, copied my library (from a separate folder on the same disk as my Time Machine backups) to the main machine, repaired permissions, but nothing has worked. The problem seems to have something to do with the database in my library, as the crash comes from sqlite3_step.
I'd like to recover my library, as I have no backup (I hadn't realized the TM-Aperture problem was fixed in 10.5.2). I'm wondering if manually removing the half-imported iPhoto import could fix the problem, but just removing that folder from the library package doesn't seem to suffice.
Here is the crash report:
03/07/08 04:46:30 Aperture[693] Thread Database Controller Exception Exception in Aperture: sqlite3_step
Backtrace:
0x0007043d (in Aperture)
0x92234eb7: +[NSException exceptionWithName:reason:userInfo:] (in CoreFoundation)
0x92235023: +[NSException raise:format:arguments:] (in CoreFoundation)
0x9223506a: +[NSException raise:format:] (in CoreFoundation)
0x0032b57a (in Aperture)
0x002b7177 (in Aperture)
0x002d41aa (in Aperture)
0x008ee625 (in ProXTCore)
0x008d88e3 (in ProXTCore)
0x008e967c (in ProXTCore)
0x008dcc09 (in ProXTCore)
0x008dc8fe (in ProXTCore)
0x9541a5ad: -[NSThread main] (in Foundation)
0x9541a154: _NSThread__main_ (in Foundation)
0x92fc5c55: pthreadstart (in libSystem.B.dylib)
Caught while posting: MSG --- CAT: RKDatabaseCategory(0xA03); TASK: (0x1); PRI: 6; REPLY: 0; SYNCH: 0; THREAD: <XTMainRunLoopThread: 'Main Thread' 0x1335890, parent: 0x0, state: 2, handlers: <XTDistributor: 0x133b810>>; DEST: (null)

Answer 1

So, I seem to have solved my problem. Removing the "Library.apdb" file didn't solve the problem, as Aperture just regenerated an empty file, so all of the library was there in the Aperture Library package, but none of it was accessible within aperture.
Instead, I replaced the "Library.apdb" file with the older version from the backed-up Aperture Library from the 1.5 version. On starting Aperture, it gave me a warning about inconsistencies in the database and restarted and regenerated a new version. Voila, it worked. It would be nice if you could just do that manually (if I didn't have the other file I would have had a problem).