I have this happen rotary cutting too. The blade will not cut through the fabric. It will glide over in spots on certain batiks. Changing blades didn't help at all. I took the fabric and cutter to guild to demo how it would not cut. I got a lot of yeah right replies so those with rotary cutters tried to cut the batik and got the same skipped spots no matter what brand cutter was used. Scissors worked though. I doubt I buy any more batiks after my what is gone from my stash. The new batiks are not like the older type at all. They are much thinner and more solid.