I also have had it shut down when I try to schedule on the app. I can click an assignment and the date it is due, then when I click the next assignment and click the next date, the app just shuts down. When I reopen the assignment is there. I did discover that if I assign one date, then click a different tab on the app (say "Today") then click back to "Lessons" I can keep going without the app shutting down each time, but it is a bit cumbersome. I tend to do my assigning on the Mac, upload and then download to the app, but some days I want to be productive while on the go. Just thought I'd let you know this little glitch too.