KGCore plugin Final cut pro 7.0.2

Hello to everybody!
I have a problem with my Final Cut Pro 7.0.2.
I'm working with a HD project. All media is stored on ISIS Avid server.
The thing is that i have no idea why but sometimes FCP crashes. The error is about KGCore plugin.

Applications/Finalcut pro/Contents/Frameworks/KGcore.framwork

What i've done is:
- to trash preferences. It works but only for a short time
- I created a new sequence and I pasted the project.
- I repeared permissions of my mac pro 4.1

the thing is that FCP is still crashing and i don't know what else i can do.
Any idea please? It's very annoying... :-(

Thanks a lot!!!!!!

Carlota