Okay, I've been quilting for awhile now and I think I've figured out how to replace the cutter blade, BUT I just replaced one today and the thing cuts horrible! With a fresh blade I cut 4 layers of fabric and I had to keep redoing the same cut line, which as you know leads to shreds. Not sure what's going on here. I know the cutting table (from JoAnns) has a little give to it but it's never given me problems before???? What ya think?