Why did "From" address detail change today 05/13/2009?

Yesterday when I sent out an email my "From" information (on the recipients copy) displayed "Carla Rei" . However, TODAY 05/13/2009, the "From" field displays "crei11744@yahoo.com" . I think Yahoo! did a software update during the night and this BUG was part of the release. The problem with having my name ("Carla Rei") as the sender replaced with my email address in the quote marks (in addition to being repeated within the lesser/greater symbols) is that it causes the recipients Inbox to reflect ONLY my email address as the Sender and they won't see my name. Consequently, if they're not familiar with just my address, they will very likely delete my message without even opening it. This is a HUGE problem that Yahoo! needs to fix ASAP.