John, please !
Purge your events.txt file of ALL events except two. One is "low" (just an example) another "catastrophic". Arrange the file that "cat." goes first. Edit settings.txt so events freuency is really high - just to save time. Start a new game with max.events severity "low". Report your results. I GUARANTEE you will see catastrophic event. Moreover, it will have the relative frequency equal to "low" event.
