I had tons of thread tension issues. I tried out a spool of Decobob thread by Wonderfil, and after hours of struggling and frogging, I gave up and went back to Glide. I do love Glide, but it is so much thicker than the 80 weight Wonderfil thread. I love the way you can just see the texture with Decobob or Invisifil, but not the thread. I won't give up - I will keep trying.