Seconded. It seems that ESM only currently supports the nessus NBE format, which is both deprecated across Tenable products and not supported in their Enterprise "SecurityCenter" app either. I just spent 30 minutes searching via Google but cannot find any scripts that can convert NBE to .nessus(v2) format.
McAfee needs to fix this, preferably quickly.
EDIT: OK this actually works. I changed the format from "NBE" to "XML" and it properly parsed the .nessus(v2) output that I exported/downloaded from my SecurityCenter appliance.
It would be cool if McAfee supported using the XML-RPC API into SecurityCenter to download the reports since the Tenable Virtual Appliance does not allow inbound FTP, SCP, CIFS, NFS, or anything.
We are exporting the data to a csv and creating a SQL database for it which we'll pull from using the McAfee Collector.