Well I just had the plague event, however I was playing as the Yor so I assumed that it would not effect them. Instead it seems to do something else.
After this event, the next turn I tried to fleet a couple of ships, but it said I couldnt, apparently my logistics ability got set to 0! (i.e. I have no logistics points!) Needless to say I saved the game.
Emailed the save.
Be wary of the plague as Yor!!!!
Also I noticed this in beta1/2 as well as 2a, is it meant for a +2% courage for aquatic world colonization? it is the only one in the tech tree to give a courage boost which to me seems like a bug?