I have managed to break a multisite, the urls are messed up

I was working on subtleimpressions.com which is the primary site in a multisite. The other active site in this installation is kegcollarsonline.com . When I was working with the Themeco Pro theme header something went wrong. I have disabled and enabled the plugins, but it is the theme which is causing the problem. I have been using this theme for a long time and it has worked well until today. Would one of the WPDEV team be kind enough to take a look at this and see if you can find the error and maybe fix it? This was a good looking site until the theme developed a problem.
Thanks in advance for all of your help.