How can I change the thumbnail size in a default 3.5 gallery? I don't want the 300x300 thumbnails... and they seem to be just blown-up 150x150 thumbnails. They are all fuzzy.
Also, how can I insert a gallery but only have one preview image?
I've been using Nextgen for years but am trying to use the WP3.5 image handling and the EasyFancybox plugin.