the whole rightside in that weasley shop seems to have that issue. the buttons to change to Books/items/cards aren't clickable, and if you click all the way up in the Items tab, the 'up' arrow throws you back to the office as well, both in windowed and fullscreen, so there's s omething missing, a field not properly defined or a typo in some line. if your un with cheat (easy) you can at least 'get all books' but that's that.
also, OLD SAVES WILL NOT WORK i confirmed that, moved them around to any possible location, they get locked because they are not compatible. if you still try to load them, you may run into errors because of the optimizing that took place. just imagine that all the inner workings run different now.