Premiere Keeps Crashing, Etc.

I am Mac based working on a half hour dramatic program shot on DSLR's using Plural Eyes. Everything is OK until I ad filters, then Premiere starts crashing more & more. It crashes when I render.

My sound was messed up but I think I fixed part of the problem by throwing out the "Adobe Premiere Pro Preview Files" folder. I'm outputting a movie as I write this.

I think I have a powerful system. I have the source files on a software FW 800 RAID drive I set up using the disk utility. I had the premiere file on a separate FW 800 RAID but now everything is on the software RAID.

When it crashes it opens a copy of the previous file, I am working on a copy of a copy of a copy of a copy.....

Any suggestions?

Thanks

- MacPro5,1 2.4 GHz, Memory: 32 GB