Hyper-V machines not backing up when SQL installed

Hi,

We are having an issue when backing up hyper-v machines in a 2012 cluster. DPM 2012
will attempt to backup the VM but the job will stay in the queue forever at
0MB. We think this may be because the vm's have SQL installed but are not sure.
Some other VM's without SQL are going through ok once the stuck jobs have been cancelled.

The Job does not error or fail just stays in the queue stopping all other VM backups.

If anyone has any ideas on this it would be greatly appreciated.

Thanks