If you're not cracking any of your captured LM/NTLM hashes, they might be corrupt. I have found that Python hash-dumping tools may output corrupted hashes. NtdsAudit will at least throw errors if the data is bad.
More here: https://media.blackhat.com/bh-us-12/Briefings/Reynolds/BH_US_12_Reynods_Stamp_Out_Hash_WP.pdf
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