I learned the same thing you did very quickly. I check the stitching on a side piece before I go back to the real quilt. Then I quilt about 4 to 6 inches and look at it underneath.
Something I learned about ripping. I roll my quilt until the bad stitching is on the top of the roller and then I rip standing up without taking the quilt off the long arm, then I just roll it back into place to start again. Takes a lot less time than taking it off and then putting it back on and then lining it up again.
Edited to add: Forgot to say that I pull off the thread off the top after I roll the quilt back in place and lined up again. That little bit of thread does help with getting it lined up again.
Last edited by Barb in Louisiana; 06-10-2016 at 05:50 PM.