So how much time would it have taken for the plugin author to investigate this as I did today.
The solution is to exclude the the URL in WP Super Cache.
Click on the Advanced Tab, scroll down to box under the text below this:
"Add here strings (not a filename) that forces a page not to be cached. For example, if your URLs include year and you dont want to cache last year posts, it’s enough to specify the year, i.e. ’/2004/’. WP-Cache will search if that string is part of the URI and if so, it will not cache that page."
Enter part of the URL that has the form
Click Save
Problem solved!