Using Disk Warrior on external drive causes MacBook crash

I work on MacBook System 10.6.7, I back up to LaCie external drive, which I partitioned so that one partition is only for backup, the other is bootable. On this partition I have a clone of Disk Warrior (4.1), to use on the MacBook .
Today I ran DW from the MacBook on the external drive for the first time, because lately it happens that the backup partition does not always appear in the finder (still performs back up though). I applied it first to the boot-partition, and it told me there were some problems. When it got to replacing the directory, the computer crashed mid way.
I performed Disk Verify on that partition through Disk Utility, and it said that it needed repair, and then that it did repair it. Checked other partition, no problem.
Tried again to rebuild directory for the external drive, and both partitions caused the MacBook to crash. I then booted from the external drive to see if it works, and ran DW on the MacBook, and had no problem there.
Anybody can tell me if it is the MacBook that caused the crash, or if the problem is with the external, and if there is anything else I can try to sort it out?
thanks,

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Using Disk Warrior on external drive causes MacBook crash

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