3D FlipBook - Not able to Enlarge book - It used to work GREAT

I have been using your plugin for years and it worked great. Now it displays a book 1.5 inches high. Please help me solve this! I have watched the video you recommend, but I find it difficult to learn how to make my book bigger. I have the pro version. I have also read the documentation several times. Without me making any changes the book has displayed from: working well, displaying large on my 27" iMac to starting small and expanded on its own to overflow the screen. now it is 1.5 inches high and stays small. I have spent 4 or 5 hours trying to get it to display properly and have failed. Here is my current short code -- [3d-flip-book mode="fullscreen" urlparam="fb3d-page" id="29059" title="false" template="white-book-view" classes="fb3d-h-1000,fb3d-fs-dark"] I will not be able to fix this without your help. I would love to keep using your plugin, but unless I can get support to fix the size problem, I will have to delete it. Can you please assist me? Thanks much, Doug