Hi Al,
With some help from Jamie Eubanks, I was able to track down this issue so it will be fixed in the next release.
However, my previous advice should solve it, the problem is it is setting an incorrect new authentication cookie (which it should not do in the case of ldap so it is a bug) after you change the email. Logging out and logging in again or clearing the cookies and logging in again should solve it.
Best,
Joe