I tried to update the Residence Person Detail of many of my members. After a couple of minutes I can go back and see that the description field with the information I have put in has been replaced with the word "undefined", and it acts like it has been reset or something.
Also, any time I set an email address for a person, it fills that in the "Residence" value with the word "Email:" before it. It won't let me put both an email address and other information - it just resets it with that weird undefined.
I worked around this problem for now by using Adding a Custom Event with residence information, instead of putting it in the Residence field. But I'd much prefer to use the Residence field since it's much easier to find, and more appropriate.
