+1 here (openhabian 3.2.0-SNAPSHOT - Build #2570):
My org.ops4j.pax.logging.cfg was empty.
Adding
org.ops4j.pax.logging.log4j2.config.file=${karaf.etc}/log4j2.xml
and restarting the openhab service solved the problem.
In my case, deleting events.log wasn’t necessary.
@Paul_Vennhaus
Thanks for documenting the solution!