Without reading through all the posts, as this is a repeat question many times over, I have had no problems. Mine cut as well as teh Olfa blades I used to buy from JA's. Be sure you do not have two blades on together. Sometimes the oil makes them stick together. Carefully take tehm apart if you do. I use a paper towel folded up and grab each side and pull opposite from each other. Also, take it off and put it on with the inside facing out. Could make a difference. Otherwise, do a SEARCH at the top of the ribbon(page) and type in 'Harbor Freight Blades'. Lots of tidbits on those threads.