I looked at the site and I think the problem is the quotes in the shortcode. It contained angled quotes, which are normally used by visual editors. WordPress ignores this type of quote when processing shortcode arguments.
What you need are straight quotes, which is what are input using the normal WordPress editor (you can check by using the ‘text’ tab instead of ‘visual’):
I created a private post here that shows the different quote types:
And also corrected the original mashup.
I hope that helps!