If your custom thumbnail sizing (or 2x) exceeds the size of the thumbnail we create from your original image we now use the original image instead. Your giant thumbnails will be crisp on all the high res screens.
We've also added a couple new thumbnail settings Globally and as Overrides in individual menu items (galleries).
Thumbs Only. When you turn this on in a menu item (double-click a menu item in the Media Library) your thumbnails cannot be clicked to see the larger image. This is pretty nice if you just want giant thumbs and no single images.
Use Original Image. When you turn this on in a menu item it forces the use of the original full-size image for ALL the thumbs (not just when they are bigger than the thumbnail we create for you). This is useful if you want to skip our thumbnail creation but can lead to longer loading times because we will always load the original image as the thumbnail.
For Global Settings: DESIGNS then DESKTOP LAYOUT then THUMBNAILS
For Overrides: MEDIA LIBRARY then double-click a media item then THUMBS OVERRIDES