I was having the same problem.
Exception Type: EXC_BAD_ACCESS (SIGBUS)
Exception Codes: KERN_PROTECTION_FAILURE at 0x00000000007e872a
Crashed Thread: 0
System 10.5 iMac
This morning I upgraded to 10.5.2
After the upgrade I tried the filemaker upgrade and it worked!!
Only 3 days of down time.