sorry for the confusion
here's whats happening.... If I have the "details.php and the results_grid.php" files that are in the zip file called "doesn't work if no coupon" ... if there are no coupons active, no one can select a size and add it to cart, it hangs on checking the inventory.... BUT if there is a coupon active, whether it applies to the product or not, then those files work....
the other set of files in the zip called "coupon-notworking" work if there is NO coupon active, but as soon as you set a coupon it doesn't work
does that make more sense?