Hi and sorry for such a delay with my reaction.
Official Google Translate API is paid, but there were workarounds to use Google Translate for free by accessing API used by translate.google.com. Google didn't seem to care previously, but now they started to take measures and block these workarounds. If a new workaround is found, it works for some time but then Google finds a way to block it. This is not the first time it happens: see #36, #49, #52.
At some point, Google might protect their API in a way that you can't make a workaround anymore, so there's no guarantee that Google Translate will continue working in TAO Translator.
Unfortunately, I don't have any time for TAO Translator currently, so don't expect a fix to appear soon even if a workaround exists. Sorry for that.