A new image is available for testing: http://dev.packages.vyos.net/iso/testing/vyos-1.1.8-rc2-amd64.iso
If you are using VLAN interfaces, avoid the rc1 one and install the rc2 right away. Thanks to Samir we have identified a bug in VLAN interface configuration scripts (https://phabricator.vyos.net/T435) that prevented them from loading correctly. It was caused by an overlooked syntax error in the new options for ingress/egress VLAN QoS options.
Oddly, the current branch had a correct version of that patch, so 1.2.0 builds are not affected.