Hi everyone,
I have found a solution to this problem! It's a little bit messy but doesn't involve hunting around and editing files in the terminal.
First you need to turn on the Develop menu in Safari: go to Preferences > Advanced > Turn on Develop Menu
Now log in to your Profile Manager web page and go to add a font.
Go to Safari's Develop menu and select Show Page Resources
On the left side of this new pane, open up the Stylesheets folder and select the stylesheet inside it.
Now scroll down (not all that far) and find the entry:
.sc-hidden {
display: none !important
}
and change it to the following by cutting and pasting:
.sc-hidden {
color: white !important
}
As you can see, it's a little messy but you will see there is now a + button.
Hope this helps some people out there. I was determined to get this working as this is really all I wanted the Profile Manager for!
Regards,
Jim.