My only app based issues are with store apps. Notably drawboard and onenote. Will lock up after coming out of sleep, and then when re-launched in tablet mode (which I acn't turn off without re-booting) they get stuck at the "loading screen", else launch to blank content (e.g a pdf will just display blank pages).
The printing to pdf issue is along the lines of "could not connect to printer". I have the same type of error if I attempt to print to onenote.
I am really liking the night light feature though. I've found it has reduced eye strain during the day while reading text books for 2-3 hours. Normally my only option was to turn the brightness way down, which was far from ideal.