XenServer 7.2 Upgrade Broke xsconsole Networking

I'm in the middle of upgrading a pool of identical servers from 7.1 to 7.2 and have hit a problem with the third server I'm upgrading.

After the upgrade (which was successful) the server no longer shows any network interfaces or configuration in xsconsole.

Here comes the weird part - the server does actually boot up, join the pool and all it's networking appears fine in XenCentre, it can access all networks, repair network storage etc... - it just seems that xsconsole is broken.

I'm hesitant to continue on with the rest of the pool upgrade in case things just stop working.

Any ideas?