Keep getting an "unexpectedly quit - error number 2". Then in the resultant crash, a long list, part of which follow. Note in this case Thread 4 crashed so I have only included that part.
This is on a PPC DP2.5GHz 10.5.8.
Alas I suspect use of a NULL pointer here...
Cheers.


Exception Type: EXC_BAD_ACCESS (SIGBUS)
Exception Codes: KERN_PROTECTION_FAILURE at 0x0000000000000000
Crashed Thread: 4
...and then...

Thread 4 Crashed:
0 libobjc.A.dylib 0xfffeff20 objc_msgSend_rtp + 32
1 uk.co.markallan.clamxav 0x000106ac -[FileCounter startCounter:] + 652
2 com.apple.Foundation 0x958c1d84 __NSThread__main__ + 1004
3 libSystem.B.dylib 0x961860c4 _pthread_start + 316
... and then...

Thread 4 crashed with PPC Thread State 32:
srr0: 0xfffeff20 srr1: 0x0200f030 dar: 0x00000000 dsisr: 0x40000000
r0: 0x000106b0 r1: 0xf0206650 r2: 0x00000000 r3: 0x0743e5c0
r4: 0x9733759c r5: 0x00000034 r6: 0x0000e0aa r7: 0x00000009
r8: 0x074fc080 r9: 0x00804200 r10: 0xa09d36ac r11: 0x68cd759c
r12: 0x002f0032 r13: 0x00000000 r14: 0x00000000 r15: 0x00000000
r16: 0x001d3500 r17: 0x00000000 r18: 0x00000000 r19: 0x00000000
r20: 0x00000000 r21: 0x0001a884 r22: 0x0001c11c r23: 0x0001c078
r24: 0x001d3920 r25: 0x001d4680 r26: 0x0001c044 r27: 0x0001c714
r28: 0x0001c0d8 r29: 0x0001c000 r30: 0x00000001 r31: 0x10624dd3
cr: 0x44008422 xer: 0x00000000 lr: 0x000106ec ctr: 0x923ef1cc
vrsave: 0x00000000

Binary Images:
0x1000 - 0x19fff +uk.co.markallan.clamxav 2.0.4 (217) <5976722f31206526c27ff5f2281df5b0> /Applications/ClamXav.app/Contents/MacOS/ClamXav
0x29000 - 0x3cffb +org.andymatuschak.Sparkle 1.5 Beta 6 (313) <890df6f6a1b32b77720af2a09942449c> /Applications/ClamXav.app/Contents/Frameworks/Sparkle.framework/Versions/A/Sparkle

... etc...