Have you checked your Tumblr settings? If it's not just that they need further permissions, then they probably have changed their API (application interface). So yes, our code in TumblFeed.htt will not work if this case.
In Photoblogger there are "Twitter" and "Instagram" feed boxes available. I haven't checked them recently though. You know these big companies change their interfaces several times a year, and the skins might lag in implementing the latest changes.