There is a bug with the game messages that get sent out to players. The last 2 riders I have had retire I got a blank message that just said retired. It does not say what rider retired in the message.

The second glitch that I just noticed today was when my rider retired it also pulled all the horses under that rider and deleted their managed shows. I have not noticed this in the past that it removed the managed shows usually it would just not run any until a new rider had been selected

Part 1 has been fixed. Part 2 is not a bug. It is supposed to delete the BM entries.