I've taken a look at a huge number of broken links reported by my sitemap as a result of this plugin - over 14,000. Apparently the plugin doesn't strip the slashes out of the declarations of classes and URLs. You should take a look at this. I looked in the code and apparently you need to apply a stripslash directive for every area where characters are output as html or they will incorrectly contain slashes.
Look in the bottom part where the variables are created. Lots of these /\' and slashes that don't belong.