Conflict with SEO Yoast described here hasn't been solved in Nextgen 1.9.5. Solution is to add the following line:
$newimage['src'] = $image->imageURL;
just above the line:
$this->images[$src] = $newimage;
I thought it would be corrected in this version, so now I hope for the next. Who has the two plugins, must check the sitemap submitted to Google webmaster and redo the correction.