Wrong cache front page with any GET parameters.
I have multicurrency field type, which generates a field value and prefix based on GET parameter and COOKIE. COOKIE is the first condition, GET parameter - the second one.
And use hook_url_outbound_alter() to rewrite all links with adding of the query_string values needed.
So, i have following path types: site.com/?c=EUR | site.com/?c=USD | site.com
Without boost cache -it works.
With enabled boost cache i get the same content of front page with any types of GET['c'].
On other pages the boost works as well.