On the docker -> docker repository section, changes to the template repositories seems "flaky" I can't seem to get it to take a new repository (I have a testing repository I use before we push stuff to CA)
Can get it to "stick" by editing /boot/config/plugins/dockerMan/template-repos but it doesn't seem to trigger an update to the templates available.
Going to guess @bonienl is the man to talk to about this. As always happy to test or provide more information if required. Have looked at the logs and couldn't see anything relevant or useful.