I've read some threads about problems with GTranslate since end of October.
It is the same for me...
A week ago GTranslate worked seamless on my Tea Timer Website.
But "yesterday" it stops working.
At my side nothing changed - same computer, same browser (Firefox),
no new browser add-ons (tried it with deactivated add-ons too).
For me it looks like Google changed something, because I always get
a 'hidden moz-box' at the bottom when I try to translate a page.