When I installed Yosemite and hit the spacebar on a gif, I had a window pop up asking me to installl java which tok me to the apple website with the download button for java 6 SE legacy something. I downloadedinstalled it and even restated. But still animated gifs (or gifs in general) do not show up in quick look. It shows me a still image of the gif inside of the box with all the little file information to the right of it but doesn't show the image in the full window like jpegs, nor does it play the animated gif. I could have swore these were working for me in Mavericks.