I just created another account on Beta Cluster to test an AF bug. In order to be comfortable with editing interface, I went to preferences to disable the new editor. However, when I attempt to save, I get the following error:
Sounds like something with preferences is broken, and in fact it happens for every preference option. Although this only happens on Beta Cluster (group 0 is clean), I still have to determine whether it's a problem with BC itself or something that'll go in the next train.