I've tested with a mix of Windows 7 and Windows Vista machines and I get random errors (index corruption, table corruption and C0...5).
The most strange is that the errors occurs always in the same Windows 7 machine.
I've also tested with two Windows 8 machines and I can't get any error.
Despite the fact that I didn't get any error in Windows 8, I'm not confident to confirm that SMB bug was fixed...