I recently watched a video produced by Olfa about their rotary cutter and cutting mats. Over the years, when my rotary cutters started skipping threads, I assumed it was due to a dull cutting blade. I would buy a new blade but still had the same problem...some of the threads were not being cut. After watching an Olfa video regarding their cutting products, I had an AHA moment. My problem might be the well-loved cutting mat and not the rotary blades. After purchasing a new Olfa mat, all my blades now cut as if they are new.
If your rotary cutter is skipping threads, ask yourself.."How old is this mat." It might not be your blade... you need a new cutting mat."