I've been grouping my photos together in albums, which I'd not done before, but half way through doing it the album preview in the album list has changed from being a nice grid of six images to just being on image. You should be able to see what I mean here: photos (that link takes you to the third page, scroll down half way and you'll see it).
Also, when viewing a specific photo there's a "details" tab in the sidebar with eg. the filename and date etc. Is there a way to prevent that from displaying?