Hi I spent a long time remaking a book. I just tried to go back to it and on opening Aperture there was a message but I missed it, this might be nothing. The problem I have is the book is still there but the theme/format has changed. Has anything changed in this sine Yosemite, is there a way I can roll back to the theme from Time Machine? I was happy that the book was all remade should we ever need to print again, I dont really want to spend the time formatting all the images to the pages again. Thanks.