Haha, I just entered the forum for the exact same reason. I thought something had gone seriously wrong with my font library (as I had that experience before, when sudenly one system font was missing) so I started activating fonts I did not use.
I hope its an april fools joke too though, but Im glad to see I'm not the only one with Comic Sans plastered in the Corona menus.
I'll check tomorrow before asking how to fix this...