The very first quilt I made (Bento Box) had an error on it (the earliest version I believe). Since then I've made only a few quilts from a pattern.
But recently I started a Mystery Quilt Block of the Month - a freebie - but run by competent people (one of whom is famous for the Dear Jane Patterns - so you would think "knows how to write a pattern"!). SOOO many of the block patterns have been wrong that a bunch of us that were following it just plain stopped. So disappointing!!