So far, I've had a lot of fun trying to come up with creative, sometimes derivative plagues. However, one little slip up regarding setting up transmissions or symptoms seems to break a lot of the default events and government actions.

The latter can be fixed by editing in the traits again in the government actions. However, the Scenario Creator should, in my humble opinion, allow you to freely edit the default events individually as well.

I have at least one plague that can't overcome the airplane/ship sterilization technology random events even with Air/Water transmissions in effect and it's gonna be a total bugger to try to fix that. And I think I broke any symptom combos I could've gotten, too.