Another guilty party here!
Have to tell a story too. . . Yesterday I finally decided I'd had enough of trying to use a blade that skipped. So I get out my cute little pack of new blades and open it up. The blades are all gooey with the lubricant and I don't want to cut myself this time so I kind of lift up the blade with the screw of the cutter and reinstall. Have the usual bit of a problem with reassembly but get it done. When I start cutting it seems like there's an awful lot of thread residue on the mat, but figure maybe this piece of fabric is just not quite on grain. And it seems to not be quite as responsive as expected. Chalked that up to fuzz sticking to the lubricant. Go do something else for awhile. Come back and straighten the end of my next piece of fabric. There's an extra thread the whole length of my cut. What the heck?!? Look closely at my cutter and I had put TWO blades in there. No wonder it was behaving strangely!