If I may interject, I can reproduce this in PIE by bringing up the gameplay debugging tool (’ (apostrophe key)), then stopping PIE (Esc) [i.e. quitting PIE with the tool on]. On subsequent PIE, log is not shown on screen. As mentioned, quitting the editor with logging in this state requires a couple of editor restarts to restore. Sometimes, bringing up and hiding the gameplay debugging tool restores printing as well.