I was able to screenshot an error that flashes every time I access the "Customize" option on one of my subdomains. The error is being caused by the "New Blog Template's" blog_template.php file, line 81. Click Here for a screen shot of the error. The subdomain I was working on is not being used as a blog template. It appears to be part of some verification the plugin is running when accessing the "Customize" feature.
Thanks for your help.