I had the same problem with the first package I opened...I found I had put both blades in the rotary cutter. They come as a two pack, so double check that you only have one in the cutter.
~Shirley[/quote]
Thanks for the hint, Shirley. I checked and I only have one blade in there. Complete mystery to me, unless it's because it's an Olfa cutter. I just read here that they don't work with Olfa. Anyone else using an Olfa with them?