I'm having that same problem. When I start a lesson the first thing I do is print all of the notations for the complete lesson then go back to the first lesson. But now lessons that I only visited to print are marked complete making it harder to keep track of where I am. The help section has an explaination of how to "uncomplete" a lesson, but it does not work for me.
Gary
[Epiphone Les Paul Standard Plus Top Pro (2), Fender Player Stratocaster (2), Fender Player Telecaster (2), Squire CV 60's Stratocaster, Hamer Ecotone, Yamaha APX600 (2), Epiphone ES-339, GTX-100 (2), Spark 40 (2), Spark Mini.]