If you somehow ended up with several empty or undeleteable albums in your gallery thanks to Google+ and syncing, maybe this will help. I had two, "scrapbook" and "scrapbook (drafts)". Couldn't find them, couldn't delete them, weren't visible in Google+ or anywhere else. The answer was Picasa. If you've ever had or used Picasa, there is a chance you've got an album there that Google is picking up and syncing. If so, go to https://picasaweb.google.com/home Click on the "My Photos" tab, click on the offending album, click on the "actions" tab, and choose "delete album". Hope this helps!