The Prof hired to teach this course was writing a textbook at the time and that was to be our textbook. When I say writing, I mean really writing. Each week we had to go to the college bookstore and pick up photocopies of the latest chapter as he finished it.
The complaints started when nobody could make head nor tail of the thing. In one of these installments three pages were left out and nobody, not even the Prof caught it.
He was not hired for a second semester.
When I was in PracticallyIvyLeague University, one professor was writing the textbook for the first course in a series of 3. Think Very Technical Course 101, 102, and 103. The textbook was copied, chapter by chapter, as we needed them. There were lots of typographical and logical errors. We were beta testing that textbook. I was otherwise an A student, but I got a C in this course. I was having problems understanding the concepts and it didn't help when I followed the textbook point by point, only to find out I memorized the incorrect information. It didn't help that the professor's student helpers were so much in awe that they would not admit that any part of that textbook was wrong. When I sought help from the professor, he told me that I should know those were typos and not memorize them, then he asked me "Why do you keep reading the textbook if you don't understand it?"
I think the latter comment belongs in the "brain-hurt conversations" thread.
Even more brain-hurty, after I graduated, this professor went on to be the Dean of the School of Engineering. I changed majors because of him. If I didn't understand 101, I was going to have more problems in 102 and 103, also taught by the same professor from the same "work in progress" textbook.