Just installed Sirocco as a add-on site (subdirectory) to a root site.
Whilst I was waiting for the DNS to propagate I loaded the rocketlauncher via the root site and set it up. All seemed to work.
Now when I log into the site, directly to the add-on site, I find that I cannot make any changed to the Template manager for the Gantry templates. The pages are there but the buttons are all unresponsive. If I log in using the root site they all work fine.