I bought a combo cutting mat, 6 x 24 ruler and 45 mm rotary cutter. I have the same issue (have tried several different blades and brands) same thing, the cutter skips. I notice the last couple pairs of rag snips I bought didn't last long either. I guess Fiskars is losing quality like so many other companies today. I plan to replace the cutter and warped cutting mat with another brand as soon as I can.