Just a fyi:
I could not get the plug-in to work with https forced on which is defined in the wp-config.php file.
I had to manually set the following variables to falsebefore I could save the GTranslate plug-in changes:
After saving the GTranslate plug-in settings, you can set the above parameters back to true and it will continue to work fine.
I believe this is the case because when you attempt to save settings using GTranslate, it posts the URL as http and not https.
Perhaps the next step is to make the plugin smarter by detecting the protocol being used in the admin panel?