Possible bug with Office 2003 hash - no collision found

Hey guys, 

I got a problem with this Office 2003 hash:

<removed by philsmd>

Running hashcat:

./cudaHashcat64.bin -m 9700 ~/hash_to_crack.txt -a 3 ?b?b?b?b?b -w 3 --outfile ~/cracked_hash.txt

It completes 100% but no collisions is found. 

Recovered......: 0/1 (0.00%) Digests, 0/1 (0.00%) Salts

I'm using cudaHashcat 1.36 and NVIDIA 346.82 driver.

Reading through the forum I found a similar problem with AMD's catalyst driver. Do you think this problem is similar?

Thanks,
--merc