I've been making books for quite a while and just started having this problem where my cover has little tiny rips at the fold. I've done everything I can think of to make it not happen. I've made my cover in three pieces, front, back, and spine with a gutter to accomodate the fold, bone folding, not bone folding. Anyone have any suggestions on how to keep this from happening?
oh, I am using regular scrapbook paper and it's happened with several different brands.
Here are some photos.

