OK, I'm not the brightest plate in the cupboard but eventually I catch on. I've been blaming my film holders for leaks when all of a sudden the lights went on. DOH!! Leak's always in the same corner and the film holder channel is also blackened. So I have a years worth of 12X20 work (OK, so that's less than 20 sheets) that I never had a fighting chance of getting perfect! Arrgggghhhhhhh!!!! It seems that the heavy paper / foil factory packaging is prone to have the corner of the films worry a hole through the foil during shipping and the little light cardboard packaging doesn't offer any real protection if the foil / paper is compromised. I just broke the seal on my 3rd of 3 ten packs to see if that packaging was already compromised and it also was just as the other 2 were. This stuff is too costly and too difficult to be screwed up with compromised film! If you have some of those 10 packs I suggest you go check them.