odd that yours were cracked, phorbesie. ive had a couple for years and they remain in perfect condition. re: flattening ... yes, the idea is to gently place weight onto the print to allow it to eventually flatten on its own. never force, backroll, bend or crease the print. treat it like your first lover. gentle, gradual and clean are key. if it has been rolled for a while, WASH YOUR HANDS AND DRY THEM, carefully remove it from the tube ... in an extreme case, this may require gently sticking your clean hand inside, applying friction on the print and shifting/moving the inner layer of the print a bit tighter inside the tube to relieve the outer tension inside the tube. if you can move the inner edge an inch, that will be enough. once removed, gently lay it curl up, (face up, assuming the print was rolled properly) onto a large clean, flat surface. gently spread it from the center out and place something clean, like a couple of books or glasses with marbles in them near the center. i use eight, heavy tumbler glasses. (nothing sharp or cornered should be used as weight.) the edges will want to stay rolled, that's fine. gradually, move the weights to the edges so it lays flat. this could take a minute or an hour or more depending on how heavy the print stock is. don't try to place the weights immediately at the corners, this could damage things as you would really need four hands to do it carefully. you may need to forfeit your table for a day. but you will not necessarily need to flatten the print all the way. you will just need to flatten it enough so it doesn't violently curl up when you go to slide it into the mylar sleeves in the portfolio. simply storing them in there will eventually flatten them. the table/books/glasses technique is intended primarily to get them flat enough to then carefully get them into flat storage.