[Plugin: WP Smush.it] Bad response from Smush.it

Maybe its an problem of the language of server.

In an other plugin i had the same problem.

From the support:
=================

What happened: We tested this with a different language WordPress installation, but we didn’t test it with a different language server. When the locale is set to a European language, the numbers are printed as “0,2345” instead of “0.2345” and this causes a javascript error.

I’ve fixed the errors, but you will still see mixed number formats on your screen (some as 0,2345 and some as 0.2345). I apologize that the plugin is not properly localized. This is one of the next steps we need to take with it.

hope this helps

http://wordpress.org/extend/plugins/wp-smushit/