Hi,

Can you describe 'will not function' in more detail? i.e what goes wrong or doesn't happen.

This is happening in Chrome, the 'login' entry point produces the login screen with yellow highlighted username and password fields, there is no impact on the login button from mouse-over or clicking, so the screen is stationary.
Same way in Safari and Fire fox.
Oddly, IE9 seems to work. I had abandoned IE9 as (prior to this) there were issues at certain points with Composr's functions, so I relied on Firefox.
The workaround, is the clicking of the 'Admin Zone'. This will give the default theme and login so I can get in there.
Puzzling here though, is the fact that the 'Admin Zone' is even visible on the main page now, as after logout and the viewing of the page by a guest (or a fresh session), the restricted portions (buttons) of the default setup weren't visible.
For awhile there wasn't a way to access the higher functions, logging in was blocked.
...Now I remember why I stopped using IE, the save and preview buttons won't work on product entries or edits.

I forgot how bad this gets, when I shut down the site, I can't access it other than through IE. With IE I can login but can't open the site because I can't save the setting, so the site stays closed. However, I copy an administrative URL to another browser, activate that and get the default admin login screen, which will let me login there. Then I can open the site or do whatever as the save and preview buttons are working in other browsers, such as Chrome or Firefox.
This all came about with this theme change.

I attached a fixed themes/Destinations-theme/css_custom/global.css file.