Hyper-V Backups Not Capturing VHD Files

We recently upgraded Backup Exec from 2012 to 2014. Since then we've noticed that our Hyper-V backups, while claiming to be successful, are capturing everything except VHD files. Our Hyper-V environment is a cluster that runs on Windows Server 2012.

Of note: while the selection list under ClusterStorage is properly checked (including the VHDs), no VMs shos up under 'Microsoft Hyper-V HA Virtual Machines.'

I haven't been able to find much that helps - any suggestions??

Thanks!