Ok, now got the API 2.19.0, but trying to post anything to Google+ now fails entirely.
Can’t be sure of the error, since error reporting is off on my main server, but I’ll do some tests on a Dev server to see what it is. My guess, similar to problems I’m having with Instagram, is I have the updated nxs-api.php file, but my zip download doesn’t have the updated nxs-functions.php.
