Downloaded the latest version today.
Updated the config to set the base url. Set the cache dir permissions. Placed on a linux machine with PHP5 and GD installed. Everything runs ok with no errors to the page or the error_log, but the galleries don't display any thumbnails, this includes the Venezuela example. When you click a gallery, you see a very brief flash of a red border around an area I'd expect the thumbnails to be in, but then no thumbnails. It even creates the pagination for a lot of images, but no images!
If I turn on thumbnail caching, it creates the subdirectories appropriately in the cache folder, but with nothing in them.