Disappearing Events, Missing Drives

I'm experiencing some very strange behavior in FCPX. Right from the start, FCPX only recognized two drives in my system: an external eSATA drive, and an external USB2 drive. Missing were my internal Macintosh HD drive, another internal SATA drive, and my RAID0 stripe of two more SATA drives. My system is a 2008 Mac Pro, by the way.

Further, I've created several events and projects only to have the events stop showing up after I quit and reopened FCPX. The projects remain intact, containing all my media referenced from my events, but the event library is empty. I've checked to make sure I'm not accidentally filtering out all my events, and I've even tried opening the events from the Finder into FCPX, which simply goes back to the project browser.

I'm trying my best to give Apple the benefit of the doubt here - even if in the short term I'll definitely be moving towards Premiere CS5 - but I can barely even learn the ropes of editing on this new system with this kind of glitchy behavior.

I should add, more worryingly perhaps, that I -do- have FCP7 installed on the same drive. If I can muster up the patience perhaps I'll try a fresh install on a new OS partition and see if my results are any different. I'm probably due a fresh OS install come Lion anyway - I've been migrating OS'es since Panther :)

Thanks for any help.