Debugging UE4-OSC: Print string stopped working? 4.17 - Please help a newbie

newbie here.

I’m playing with the UE4-OSC plugin. Yesterday I could see OSC events on screen. Last night I crashed the engine loading a big FBX file and just ended the process via Task Manager. Today I can’t see Print String messages on screen. I tried a very simple BP to test if Print String to Screen is working. Should this work? I can’t see any messages on screen. Should I reinstall the engine?

Let me know if I can provide further info.