We are having the same issue(C9200) on the guts of our mixed media books (100GC & 70GT), the only solution I have found is to turn down the pressure roller temp. You may need to go up or down depending on the stock and your current settings but don't be afraid of adjusting all the way to the ends of the spectrum. Our default temp on the guts is 90 but ive been having to set it down to 30 on start up every morning and then keep an eye out as in our case it begins to get "foggy" after 30-50 books and i have to bring it back up to about 45(which is still only half of the default setting)