Alexander  and Grzegorz
Thanks the new 3.5.2 iso  at

http://resources.ovirt.org/pub/ovirt-3.5-pre/iso/ovirt-guest-tools/

works great, but if, as I had already installed the tools from github, you need to uninstall the old service or revert to
a previous snapshot.  I'm sure the 3.5 doc will take care of this, perhaps the 3.4 doc could be updated.
Regards,
Richard