Help! I opened Aperture, and ALL MY PROJECTS AND PHOTOS ARE GONE!

Hey guys.

As I got home this evening, I did what I always do- ran straight to my computer to import the photos I took that day. Aperture opened and launched as it normally does, but when I opened it, everything was gone. EVERYTHING. I checked to see if they may have been put in the trash, and there were still some old photos there. I located the Aperture Library on my HD, and checked the info- 89GBs. Sounds about right, so the photos should still be somewhere on my HD. Searched my computer, but alas, that is the only Aperture Library to be found.

The only thing I can think of, is that I recently downloaded a software update that WAS camera-related... I doubt a software update would be that cause behind this... but I'm clueless.

Help? Advice?

Thanks for taking the time to read/answer.